Seng Zhao’s The Immutability of Things and Responses to It in the Late Ming Dynasty

Seng Zhao and his collection of treatises, the Zhao lun, have enjoyed a particularly high reputation in the history of Chinese Buddhism. One of these treatises, The Immutability of Things, employs the Madhyamaka argumentative method of negating dualistic concepts to demonstrate that, while “immutability” and “mutability” coexist as the states of phenomenal things, neither possesses independent self-nature. More than a thousand years after this text was written, Zhencheng’s intense criticism of it provoked fierce reactions among a host of renowned scholar–monks. This paper explores Zhencheng’s main points as well as the perspectives and motives of his principal adversaries in order to shed light on the nature of philosophical discourse during the late Ming dynasty.


Introduction
The Zhao lun 肇論, authored by Seng Zhao (僧肇;, 1 has long been regarded as concrete proof that early fifth-century indigenous Chinese monks not only understood the core principles of the Madhyamaka philosophy of Mahāyāna Buddhism, but could also express such notions in the idiom of contemporary Neo-Daoist discourse. However, while modern Western scholars have made full use of mid-twentieth-century translations of the Zhao lun to explore Seng Zhao's thinking, 2 few have shown any interest in the text's profound impact on Buddhist philosophical discourse during the late Ming dynasty (1572-1620). 3 Initiated by Kongyin Zhencheng (空印鎮澄;1547-1617hereafter Zhencheng), who challenged one of Seng Zhao's four main treatises, the Zhao lun debate ultimately preoccupied a wide range of Buddhist monks over the course of several decades.
Zhencheng, a monk who devoted himself to the doctrinal study of the Huayan school 華嚴宗 of Buddhism, 4 wrote an article entitled A Logical Investigation of the Immutability of Things (Wu buqian zhengliang lun 物不遷正量論; hereafter A Logical Investigation), in which he expressed fundamental 1 Seng Zhao intensively summarized and evaluated these three schools in the treatise OnŚūnyatā (Bu zhen kong lun 不真空 論). Unfortunately, very few of the schools' own texts survive, although Tang (1955) and Liebenthal (1968) were able to provide some valuable insights into their thinking after careful study of this scant source material. Zürcher (1972) then built on Tang and Liebenthal's efforts, compared the ideas of the Buddhist schools with those of the Neo-Daoists, and pointed out the Buddhists' limitations in terms of their understanding of the concept of "emptiness" as found in the Mahāyāna sūtras. First, he suggested that proponents of xinwu yi 心無義 recognized "matter" (rūpa, se 色) as a real entity endowed with objective existence, whereas the term "emptiness" refers to the mind of the sage that is "non-existence" (wu 無) in so far as it is free from all conscious thought, desire, and attachment. This theory seems to be related to a Neo-Daoist trend known as "the exaltation of existence" (chong you 崇有), which concerns the inner "emptiness" and "mental immunity" of the sage in his contact with the world of "existence" (you 有) (pp. 101-2). Second, Zürcher argued that advocates of jise yi 即色義 held that "matter" exists 'as such (i.e., it lacks any permanent substrate, any sustaining or creative principle that "causes matter to be matter"). This comprised a Buddhist elaboration of Xiang Xiu 向秀 and Guo Xiang 郭象's theory that all things spontaneously exist by themselves, and that there is no creative power or a permanent substance behind things. Seng Zhao severely criticized this notion on the basis that it dealt only with the conditional and causal nature of all phenomena and failed to appreciate the ultimate truth that conditionality and causality themselves are mere names without any underlying reality (pp. 123-24). Third, Zürcher pointed out that members of the benwu yi 本無義 school considered benwu as the true nature of all phenomena-an absolute that underlies the worldly truth. This notion comes nearest to the true meaning of the Prajñāpāramitā doctrine as revealed by Kumārajīva, but it seems to conflate the Daoist idealized tohu-va-bohu and the Mahāyāna concept of the "nature of all dharmas" (pp. 191-92). 9 吾解不謝子。辭當相挹。 CBETA 2019. Q3, T50, no. 2059, p. 365a25-26. 10 而言物不遷論者。元康師云。莊子云。凡有貌像色聲者。皆物也。公孫龍子名實論云。天與地。其所 焉物也。 http: //21dzk.l.u-tokyo.ac.jp/SAT/T2255_.65.0112b18:0112b20.cit.
Religions 2020, 11, 679 4 of 22 wu is even used in a discussion of the Dao 道 ("Way") in the Laozi. 11 In general, in traditional Chinese texts, wu may refer to anything that a human can perceive either abstractly or concretely, or anything that exists objectively in the cosmos. The most credible Buddhist synonym is dharma (fa 法) in the sense of "phenomenon or constituent of existence". However, there is a stronger implicit meaning in wu that it is rooted in the ontological origin of the "sky and earth" or the Dao, and thus objectively exists with self-nature in the world of time and space. By contrast, in Madhyamaka Buddhist discourse, the dharma lacks inherent identity and manifests emptiness of the nature of things. That said, even though Seng Zhao used wu, rather than fa, in the title of his treatise, we should probably not interpret this as a tacit acknowledgement of the objective existence or inherent identity of things. Instead, it seems more likely that he simply chose a word that he knew his Chinese readership would understand. The phrase buqian 不遷 ("immutable" or "immutability") was much less common in pre-Zhao lun Chinese Buddhist texts than a number of quasi-synonyms and related expressions, such as zhu 住 ("abide"), budong 不動 ("non-movement"), and buqu bulai 不去不來 ("not leaving and not coming"). Buqian itself probably derives from one of the seven inner chapters of the Zhuangzi, in which an ideal person is described as someone whose "judgement is fixed with respect to the fact that there is no element of falsehood; and, while other things are mutable, he is not". 12 Here, Zhuangzi means that a sage's cognition is immutable in the sense that he is able to perceive the unchanging nature of things and so is not confused by superficial phenomena in constant motion. Having extracted the term buqian from this passage, Seng Zhao uses it to denote a particular state of things-immutability-that existed before any sage was able to perceive or understand it. So, does this mean that Seng Zhao hoped to demonstrate the "immutability of things"? Not exactly, as is evident in the titles of the other three treatises in Zhao lun. For example, On Prajñā without Knowing (Bore wuzhi lun, 般若無知論) does not suggest that his intention was to interpret prajñā, or ultimate wisdom, as "not-knowing", nor as "knowing" in the sense of ordinary knowledge. Rather, Seng Zhao praises "unknowing/not-knowing knowledge" (buzhi zhi zhi, 不知之知)-that is, impartial cognition by transcending both knowing and not-knowing. This also holds true for The Immutability of Things: while the title mentions only "immutability", the text advocates overcoming and transcending the dualistic notions of both mutability and immutability.
It might be assumed that Seng Zhao discusses two dimensions-space and time-in The Immutability of Things, but in fact he focuses exclusively on the latter. That said, the word "time" is inadequate in this context, because in Buddhist philosophy, time is merely a fictive concept in ordinary people's minds through which they perceive changes in aspects of the phenomenal world. 13 Therefore, although Liebenthal (1968, p. 45) freely translates the title as "On Time", he notes: "Lit. 'things cannot alter (their positions in the temporal order)'." This explanation is more consistent with the content of the treatise. Similar topics are discussed in several chapters of the MMK, including "Examination of Movement and Non-movement (Gatāgata-parīks .ā )" (Chapter 2), "Examination of Action and the Agent (Karma-kāraka-parīks .ā )" (Chapter 8), "Examination of Action and the Agent (Sam . skāra-parīks .ā )" (Chapter 13), "Examination of Time (Kāla-parīks .ā )" (Chapter 19), and "Examination of Occurrence and Dissolution (Sam . bhava-vibhava-parīks .ā )" (Chapter 21) (Kalupahana 1986, pp. 118, 180, 217, 275, 292). In Chapter 2, Nāgārjuna advances his thoughts through a sophisticated form of argumentation: to prove that "movement" is a false assumption, he divides it into three aspects-the mover, the moving time, and the act of moving-discusses each of these in turn as if they truly exist in the sense of self-nature, and finally renders all of them non-viable. Seng Zhao not only developed Nāgārjuna's ideas and methodology on the basis of a comprehensive and integrated understanding of his predecessor's 11 Laozi 21.2: "The Way as a thing is vague, ah, diffuse, ah" (道之物, 惟恍惟惚). Laozi 25.1: "There is a thing that completes out of the diffuse. It is born before Heaven and Earth [ . . . ] I do not know its name. Therefore, forced, I give it the style 'dao'" (有物混成, 先天地生 [ . . . ] 吾不知其名, 字之曰道). Translations by Wagner (2000, pp. 297, 283). 12 審乎無假, 而不與物遷。 https://ctext.org/zhuangzi/seal-of-virtue-complete#n2748. 13 For a comparative study of Buddhist and Christian philosophies relating to the concept of "time", see Li and Dessein (2015). work-specifically, by devising the theory of dependent arising and disproving his opponents' false assumptions-but also used expressions that corresponded to contemporary Neo-Daoist conventions.
The Immutability of Things first presents then explicitly repudiates the "generally accepted proposition" (ren zhi changqing 人之常情) that "things glide along (in the flow of time)" (you wu liudong有物流動). Next, Seng Zhao introduces two popular Neo-Daoist notions-"movement and stillness" (dong/jing 動/靜)-and explains that "'non-moving' here does not mean that motion must cease in order to produce rest but that there is rest with motion going on" (豈釋動以求靜, 必求靜於諸 動; Liebenthal 1968, p. 45). This brief summary (illustrated in Figure 1) is crucial when examining the validity of Seng Zhao's argument, which proceeds as follows: 1986, pp. 118, 180, 217, 275, 292). In Chapter 2, Nāgārjuna advances his thoughts through a sophisticated form of argumentation: to prove that "movement" is a false assumption, he divides it into three aspects-the mover, the moving time, and the act of moving-discusses each of these in turn as if they truly exist in the sense of self-nature, and finally renders all of them non-viable. Seng Zhao not only developed Nāgārjuna's ideas and methodology on the basis of a comprehensive and integrated understanding of his predecessor's work-specifically, by devising the theory of dependent arising and disproving his opponents' false assumptions-but also used expressions that corresponded to contemporary Neo-Daoist conventions.
The Immutability of Things first presents then explicitly repudiates the "generally accepted proposition" (ren zhi changqing 人之常情) that "things glide along (in the flow of time)" (you wu liudong 有物流動). Next, Seng Zhao introduces two popular Neo-Daoist notions-"movement and stillness" (dong/jing 動/靜)-and explains that "'non-moving' here does not mean that motion must cease in order to produce rest but that there is rest with motion going on" (豈釋動以求靜, 必求靜於 諸動; Liebenthal 1968, p. 45). This brief summary (illustrated in Figure 1) is crucial when examining the validity of Seng Zhao's argument, which proceeds as follows: This simple, four-step diagram encapsulates Seng Zhao's reasoning in The Immutability of Things. First, he articulates his opponents' position: "[F]rom the fact that what once has been cannot join what is now, they infer that things move. So they say: they move and are not at rest" (Liebenthal 1968, p. 47). This is Premise 1. He continues: "[T]hey know that past things cannot come [to the present], while thinking that the present things can pass [over to the past]." 14 The first half of this sentence merely reiterates Premise 1, whereas the second half comprises Premise 2. (Of course, as Seng Zhao is concerned only with time, not space, the "movement" he describes here relates to changes in a thing's characteristics as time goes by, not to any changes in its position.) Thus, according to Seng Zhao, the "generally accepted proposition" of mutability is: as things cannot proceed from past to present, some attributes of the subjects will disappear in a certain temporal point of "present"; thus, things are always changing. At the same time, as things can leave the present and move into the past, a present thing can be traced back to an earlier, partially different version of itself in the past; therefore, it has changed. At first glance, Premise 2 may seem far removed from our everyday experience, but it 14 既知往物而不來, 而謂今物而可往. We modified Liebenthal's (1968, p. 47) translation by deleting his supplementary bracketed information and rendering the original Chinese more literally. Liebenthal added the dimension of space in his understanding of the relationship between things in the past and present; however, we believe it is unnecessary to include this additional information. This simple, four-step diagram encapsulates Seng Zhao's reasoning in The Immutability of Things. First, he articulates his opponents' position: "[F]rom the fact that what once has been cannot join what is now, they infer that things move. So they say: they move and are not at rest" (Liebenthal 1968, p. 47). This is Premise 1. He continues: "[T]hey know that past things cannot come [to the present], while thinking that the present things can pass [over to the past]." 14 The first half of this sentence merely reiterates Premise 1, whereas the second half comprises Premise 2. (Of course, as Seng Zhao is concerned only with time, not space, the "movement" he describes here relates to changes in a thing's characteristics as time goes by, not to any changes in its position.) Thus, according to Seng Zhao, the "generally accepted proposition" of mutability is: as things cannot proceed from past to present, some attributes of the subjects will disappear in a certain temporal point of "present"; thus, things are always changing. At the same time, as things can leave the present and move into the past, a present thing can be traced back to an earlier, partially different version of itself in the past; therefore, it has changed. At first glance, Premise 2 may seem far removed from our everyday experience, but it actually describes the common practice of remembering things. Seng Zhao provides a useful example: a brahman (brāman , a, fanzhi 梵志) left home as a youngster and eventually returned as a white-haired old man. His neighbors asked him whether the previous brahman still existed, whereupon the brahman answered, "I am similar to the previous man, but not exactly him" (Liebenthal 1968, p. 50). In this hypothetical situation, the neighbors recalled the previous brahman through the present brahman, and they used that memory to think that the present person could be traced back to the same person living in an earlier time, even though he looked much older than before. In the process of recalling, they supposed an unchangeable subject-"brahman"-but also certain changeable aspects of that subject, such as the color of his hair.
The same reasoning is evident in Premise 1. When people say that things change because some properties of those things disappear over time, they presuppose an unchanging subject with changing properties. The Madhyamaka concept of "emptiness" repudiates this notion of an unchanging, independent, continuous subject, yet Seng Zhao does not criticize the unconscious presupposing in these first two premises. Rather, he simply points out that they are inherently contradictory: "If past things cannot come, where should present things go to?" 15 With this echo-question, he seems to suggest that the movement of things in the flow of time should be bidirectional. Thus, if people claim that "past things cannot come to the present", they should not recall the young brahman when seeing the old brahman who stands before them, because they have already presupposed that the young brahman cannot come to the present. It is in this way that Seng Zhao disproves "the generally accepted proposition" of mutability: "Thereby it becomes clear that no intercourse is possible between things belonging to different time periods" (Liebenthal 1968, p. 48).
After refuting the notion that things can move in the flow of time, Seng Zhao naturally arrives at Premise 3: things permanently abide in the time points (where they belong) or things cannot alter (their positions in the temporal order). He terms this characteristic either "nature abides" (xingzhu 性 住) or "immutability" (buqian 不遷). One might expect his next step to be a thorough repudiation of this notion of "immutability", because only by negating both "mutability" and "immutability" (opposite dualistic concepts belonging to the phenomenal world) will the Middle Way leading to emptiness-that is, the absolute truth beyond all relativity-become apparent. However, he not only neglects to do this, but even hints at tacit approval of the concept when stating, "[N]othing can move (from its position in time). Therefore, each nature abides permanently in one time period" 16 and "[E]ach nature abides (permanently) in one time period." 17 Nevertheless, in Step 3, he does deny both mutability and immutability. For example, he states, "(Things are) immutable, so (they) leave while always being still; (things do) not abide, so (they) are still while always moving. (Things) are still while always leaving, thus (they) move without mutability; (things) are leaving while always being still, thus (they are) still while not staying." 18 With his assertion that mutability and immutability coexist as things' phenomenal characteristics, Seng Zhao rejects the possibility of either existing independently and self-reliantly, and thereby denies the self-nature of both, and guides his readers towards the notion of emptiness.
Overall, The Immutability of Things reflects a rigorous phenomenological standpoint that accords with Nāgārjuna's understanding of emptiness: never suppose any metaphysical essence as the basis of this phenomenal world. Seng Zhao's thinking and methodology both conform to the requirements of the Middle Way, with the only "flaw" in his treatise being his failure to disprove immutability-an apparent oversight that he could have resolved through further Middle Way analysis. Similar to how Nāgārjuna demonstrates that movement is a false illusion in people's perception, Seng Zhao could have divided immutability into three distinct aspects-the subject that stays, the time point in which it stays, and the act of staying-in order to prove that each aspect has no self-nature and, consequently, that immutability itself has no independent self-nature.
So, why did Seng Zhao neglect to do this? One possibility is that, having summarized his opponents' position as "all things move unceasingly", he decided to build his counter-argument on the polar opposite of immutability. Moreover, "stillness and movement"-a Neo-Daoist expression that was particularly popular in Seng Zhao's time-was frequently used in place of both "roots and branches" (ben mo 本末) and "essence and function" (ti yong 體用). For example, Wang Bi assumed that "to reach emptiness is (their) ultimate; to hold on to stillness is (their) blessing. Even while the ten thousand kinds of entities may all act at once, they eventually return to emptiness and stillness. This is called 'the ultimate returning of things'." 19 With all this in mind, Seng Zhao's primary goal may have been to prove that stillness (or immutability) is one of the characteristics of all things in the phenomenal world, 20 as opposed to a state that only sages can perceive and comprehend or the original root of all things.

Zhencheng's Criticism and Proposition
No later than the end of the Southern Song dynasty (1127-1279), Chinese Buddhism entered a period of relative decline that continued until Emperor Wanli's reign in the late Ming era (1572-1620), when Buddhism entered an era of revitalization and reformation. The revival was stimulated by the Emperor himself and his mother, known as Madame Li (1546Li ( -1614, who was a devout follower of Buddhism. Generous imperial donations facilitated the rapid recovery of Buddhist communities, the renovation of Buddhist institutions and the printing and distribution of Buddhist scriptures. One important aspect of Buddhism's resurgence in this period was that it was "heralded by the rise of Buddhist scholasticism", which could be viewed as evidence that "doctrinal studies (yixue 義學) are much more enduring than other sectarian establishments" (Jiang 2008, pp. 24-25). In the late Ming era, while mainstream Buddhism was still Chan, some Buddhist scholars started to devote themselves to doctrinal studies, represented by the Huayan, Yogācāra, and Tiantai traditions. The debate over Seng Zhao's The Immutability of Things, initiated by Zhencheng and perpetuated by many other famous scholar-monks, was a significant event in this "rise of Buddhist scholasticism".
However, beneath the surface of revitalization, there was a theoretical crisis of legitimacy within the late Ming Buddhist scholastic community. Indeed, the imperial court's patronage exacerbated this crisis, as it prompted a fierce dispute between the government and the Buddhist community-as well as among the various branches of the Buddhist community-over the admission of genealogies of dharma transmission (Jiang 2008). Buddhism's decline during the Yuan (1271-1368) and early-middle Ming (1368-1572) led to a deterioration in the quality of dharma heirs and a hiatus in the transmission of Buddhist scriptures. Buddhist scholars of the late Ming era acknowledged these issues and attempted to address them, but they could not agree on a single approach: while Chan monks retained faith in the personal experience of enlightenment, devotees of doctrinal studies searched for answers in the philosophical theories of the scriptures. Zhencheng was just one of many monks who favored the latter approach, with a particular focus on the works of Huayan scholars of the Tang dynasty (618-907). In addition, he collected some fragments of Yogācāra scriptures and explored that tradition's philosophy of logic. 21 Zhencheng's critique of The Immutability of Things was inspired by an ambiguous and somewhat contradictory paragraph in the Huayan jing suishu yanyi chao 華嚴經隨疏演義鈔, a detailed commentary on the Avatam . saka sūtra by Qingliang Chengguan (清涼澄觀; 738-839; hereafter Chengguan), the fourth patriarch of the Huayan school during the Tang dynasty: (The Immutability of Things) furthermore said, "As (what has occurred in) ancient times cannot occur (again) in our time, and (what occurs) to-day cannot have occurred in ancient times, (or else) as the nature of each thing abides in (its period), what, then, is able to move freely to and fro (among the historical periods)?" (Liebenthal 1968, p. 52) Analysis: since Master Zhao intended to regard "each nature of thing abides" as "immutability", this is no different from the notion that "(the conditioned things) cannot move to anywhere else from here" in the Small Vehicle (Hīnayāna). Next, (The Immutability of Things) said, "Therefore, when he (the Sage) has in mind the final truth (paramārtha-satya), he says that (things) do not move; when he teaches conventional truth (sam . vr . ti-satya), he says that everything flows" (Liebenthal 1968, p. 50). This is regarding the ultimate truth as "immutability", while not showing the characteristic of the ultimate truth. If (Master Zhao) used "the nature of each thing abides" as the characteristic of the ultimate truth, why did (he) not (state that) there is nothing mutable because of "emptiness of nature"? It is only in the treatise of OnŚūnyatā that the meaning of "emptiness of nature" appears. (By contrast, in The Immutability of Things, Master Zhao) restricts "immutability" to the realm of the conventional truth.
In this passage, although Chengguan initially associates Seng Zhao's account of "the nature of each thing abides" with the unenlightened teachings of Hīnayāna, he then acknowledges that Seng Zhao's dichotomic explanation of "immutability" and "mutability" accords with twofold-truth teaching. 23 However, Zhencheng cites only the first part of this paragraph in his analysis of The Immutability of Things: "[T]his is to say that the nature of each thing abides in one time period, without the possibility to move freely to and fro (among the temporal periods). This is the real meaning of Master Zhao's Immutability of Things." 24 Therefore, according to Zhencheng's reinterpretation of Chengguan's analysis, Seng Zhao's proposition is "immutability" and his main proof of it is "nature abides" (xingzhu 性住), as is evident in his assertion that "the abiding nature is immutable 性住不遷". This brief statement is the principal focus of Zhencheng's critique of The Immutability of Things in A Logical Investigation. Thereafter, he presents his own "correct" proof of the "immutability" proposition by declaring that "the emptiness of nature is immutable". 25 22 CBETA 2019.Q3, T36, no. 1736, p. 239b23-c1. Chengguan mentions the teaching of the Small Vehicle, which can be found in Chapter 4 of the Abhidharmakośa-bhās . ya during a discussion of the concept of karman (ye 業). The exposition of the verse states, "(The conditioned phenomena) are produced here and are destroyed right here (i.e., they just exist for an instant). They cannot move to anywhere else from here" 若此處生即此處滅。無容從此轉至余方; CBETA 2020.Q1, T29, no. 1558, p. 67c14). It affirms the non-continuity of the body (shen 身) on the timeline, thus denying the body's motion. On the surface, this is similar to Seng Zhao's explanation of "nature abides" (xingzhu 性住), but the Abhidharmakośa-bhās . ya espouses the substantiality of things and the true existence of past, present, and future, whereas Seng Zhao's explanation stands on the basis of emptiness in the nature of things. 23 Basically, in Buddhism, the twofold-truth (satya-dvaya) encompasses the ultimate truth (paramârtha-satya, zhendi 真諦) and the conventional truth (sam . vr . ti-satya, sudi 俗諦), although there are very different interpretations of these two truths in the sūtras andśāstras of the Mahāyāna and Hīnayāna schools. For example, in the Madhyamaka philosophy of the Mahāyāna tradition, the twofold-truth denotes emptiness in the self-nature of things and phenomenal illusions on the basis of the theory of dependent arising; however, the Yogācāra school links the twofold-truth with the theory of "three natures" and regards the perfectly accomplished nature, which is perceived in a non-discriminating mode of cognition, as the ultimate truth. Meanwhile, in China, the Huayan school regards "principle" (li 理) and "phenomena" (shi 事), based on the division of the "four dharma-realms", as the ultimate and conventional truths, respectively; by contrast, in the Chan school, the ultimate truth is always related to the functioning of the mind (xin 心 To advance his case, Zhencheng applies the formal logic of the Yogācāra school, specifically a three-part syllogism (sanzhi zuofa 三支作法), which comprises pratijñā (thesis or proposition, zong 宗), hetu (reason, yin 因) and udāharan . a (example, yu 喻). 26 This enables him to summarize Seng Zhao's error as follows: "The proposition is nearly right, but the reason is wrong 宗似而因非". Zhencheng explains: "by 'the proposition is nearly right', I mean that motion does not cease in order to produce rest, and that there is rest while motion continues; by 'the reason is wrong', (I mean that) the sūtras regard the emptiness in the nature of dharmas as immutability, whereas Master Zhao regarded the abiding nature as immutability". 27 Furthermore, "In order to prove 'immutability', Master Zhao thought that previous things do not disappear and their nature abides in the past. This violates Mahāyāna teaching on the emptiness of nature." 28 This analysis forms the basis of Zhencheng's contention that The Immutability of Things violates both the standard of authority (āpta-āgama, shengjiao liang 聖教量) and the standard of inference (anumāna, biliang 比量). 29 He then provides several examples to illustrate why Seng Zhao's interpretation of "nature abides" contravenes these core components of Mahāyāna teaching. a.
The proposition that past things do not pass to the present does not prove immutability or permanence but rather "impermanence" Zhencheng accepts that past things do not join the present, but disagrees with the proposition that this proves that immutability is an aspect of the nature of things. He defines past and present things as "different things" (yiwu 異物), and the past and the present as "different time periods" (yishi 異世), then demonstrates that any attempt to use yiwu and yishi to prove immutability, as per Seng Zhao's reasoning in The Immutability of Things, violates both the sūtras and Buddhist logic. 30 Specifically, on the subject of "different time periods", he explains: Now he (Master Zhao) says that past things abide in the past, while present things abide in the present. If so, they are conditional dharmas, falling in (the realm of) moving to and fro. Since (such a "thing") falls under the three time periods (i.e., past, present, and future), it is invalid for (Master Zhao) to call it "immutability". Thus, the Nirvān . a sūtra claimed that the dharma that permanently abides is not contained in the three times, and that the Buddha's dharma-body is not contained in the three times. It is not contained in the three times, so it is called "permanent". On the contrary, what is contained in the three times must be impermanent. Who can claim what is impermanent is immutable?
Answer: This rests on two assumptions. The first is the teaching of the sage. The holy practices in the Nirvān . a sūtra extensively explain that different things are all impermanent. The second is logical inference. There are no differences among the (different things') natures of emptiness, so (the emptiness) is named "permanence". Every form or vessel/tool is different from every other, so they are all "impermanent". To discuss this difference in terms of time, [ . . . ] (things) sometimes exist but sometimes do not, so they are impermanent. To discuss it in terms of space, [ . . . ] (things) exist somewhere but not elsewhere, so they are called impermanent.
As any concrete thing can occupy only one point in time and space, it will become another thing when the time and space change, which leads Zhencheng to the inevitable conclusion that things in the past and things in the present are definitely different. Moreover, this difference proves that the nature of any concrete thing cannot be permanent, in the sense of retaining an inherently consistent self. On the other hand, the nature of emptiness-the ultimate and universal truth in Mahāyāna Buddhism-never differs in any time or place, so it is the only "thing" that exists permanently. Therefore, Zhencheng criticizes Seng Zhao for terming conventional things-that is, things with concrete characteristics-"immutable" (a synonym for "permanent", according to Zhencheng). b.
The notion that past things existed previously and do not exist now is an extension of the illusion of existence and non-existence During his discussion of past and present things in The Immutability of Things, Seng Zhao uses a pair of antonyms-being/exist (you 有) and non-being/non-exist (wu 無)-in the form of verbs: "looking for a past thing in the time point where it once has been, the thing never fails to exist in the past" and "looking for a past thing in the time point of the present, this thing has never existed in the present". 33 Zhencheng is especially critical of this approach on the grounds that Seng Zhao's use of you and wu might lead readers to one of two extreme views: either that things exist with an eternal essence, or that their essence is destroyed at the precise moment when they fade from existence. Both of these concepts conflict with basic Mahāyāna teaching on dependent arising and the emptiness of nature. According to Zhencheng: "Holding on to the notion that the you truly exists is an absolute standpoint of you that ignores the fact that dependently arisen things are empty in self-nature. Regarding the wu as truly non-existing is an absolute standpoint of wu and ignores the fact that what has no self-nature has dependently arisen." 34 Furthermore, given that Seng Zhao's reasoning is clouded by eternal and nihilistic tendencies, Zhencheng insists that his predecessor's notion of "immutability" is incompatible with "emptiness", which must transcend both eternalism and nihilism. He explains: "The relationship between emptiness and immutability is like that of light and dark: they are opposites conflicting with each other." 35 Overall, Zhencheng criticizes Seng Zhao's various errors in The Immutability of Things with reference to the "four assumptions" (si ji 四計): 32 CBETA 2019.Q3, X54, no. 879, p. 918c13-21; R97, p. 741b1-9; Z 2:2, p. 371b1-9. 33 求向物於向。於向未無。責向物於今。於今未有。 Liebenthal (1968, pp. 47-48 Master Zhao's "immutability", generally speaking, displays four assumptions-namely "existence", "non-existence", "sameness", and "difference". "Looking for a past thing in the time point where it once was, the thing never fails to exist in the past." This is the assumption of "existence". "Looking for a past thing in the time point of the present, this thing has never existed in the present." This is the assumption of "non-existence". "The past thing was in the past, while the present thing is in the present." This is the assumption of "difference". Only the assumption of "sameness" is absent. All four of these assumptions can contaminate prajñā teaching. [If a theory] includes any one of them, it violates prajñā teaching. So how could there be any "immutability"? There are many contrasting interpretations of the "four assumptions" across several Buddhist sūtras, and both "existence and non-existence" and "sameness and difference" were familiar concepts in various Chinese Buddhist schools in the late Ming period, so it is impossible to determine which of countless potential sources inspired Zhencheng to couch his criticism in these terms. That said, he mentions that the "four assumptions" can contaminate prajñā teaching, so we may at least trace the concept back to a basic principle in one of prajñā Buddhism's most important sūtrasthe "eight negations of the Middle Way" (babu zhongdao 八不中道) in the MMK. These "eight negations" are presented as four pairs of concepts: non-ceasing and non-arising; non-annihilation and non-permanence; non-identity and non-difference; and non-appearance and non-disappearance. 37 The opposites of three of these pairs-ceasing and arising 生滅, annihilation and permanence 斷常, and appearance and disappearance 去來-relate to existence (that is, "existence" and "non-existence"), while the opposite of the fourth-identity and difference 一異-relates to the relationship between two things. In essence, all eight negations emphasize the importance of avoiding extreme views when exploring things' existence as well as their relationships with other things. Zhencheng clearly believed that he could criticize The Immutability of Things on the basis of the "four assumptions" as Seng Zhao had been viewed as an authority on prajñā. c.
If past causes never cease or disappear (lit. transform), it is impossible for all beings to attain Buddha-hood, and there will never be a point of time when through the cultivation of causes one achieves the results 38 At the end of The Immutability of Things, Seng Zhao states that the fact "that (the Buddha's) karma cannot perish implies that, though acquired in the past, it has not undergone any change 功業不可朽, 故在昔而不化" (Liebenthal 1968, p. 52). Zhencheng interprets this assertion as follows: past things or events, as causes, never disappear. Hence, they extend or pass into the present and the future, leaving no time point for any results to arise. This leads to the inevitable conclusion that the ultimate goal of becoming a Buddha-which Mahāyāna Buddhists believe is achieved through practice-is actually unattainable. Zhencheng then offers an explanation as to why Seng Zhao might have made this "mistake": "Permanence" has two meanings. One is the "immutable continuity", meaning that thusness (tathatā) is immutable. The Lengyan jing (Śūram . gama-sūtra) says, in the real and eternal nature, (if people) look for enlightenment and illusion, birth and death, leaving and coming, (they) obtain nothing. The second is the "successive continuity", meaning that the results of karma are never lost. The Huayan jing (Buddhâvatam . saka-sūtra) says that the essence of the cause disintegrates in every instant but accumulates successively, and the result never loses the form (upon which it acts). The poetic verse says that it is clear that the cause disintegrates and the result then aggregates. Because of the permeating power of the similar and immediately antecedent conditions (samanantara-pratyaya) stored in the eight consciousnesses, when the preceding instant of thought ceases, it permeates the subsequent instant of thought. Even when the annihilation at the end of an age burns brightly, the results of karma are not lost. Therefore, it is called the "successive continuity". Thus, although (Master Zhao said that "immutability") is "clear", it belongs to the conditional and changing dharmas. Master Zhao used it to prove that thusness is immutable. This goes against the teaching.
In this lengthy paragraph, Zhencheng not only distinguishes between two distinct kinds of "permanence"-the "immutable continuity" and the "successive continuity"-but also draws attention to "thusness" and to the conditional and changing world that is restricted by the law of cause and result. According to his analysis, Seng Zhao misunderstood the "permanence" of the law of cause and result (or "successive continuity") on the grounds that this relates only to never-ending karma, not to unceasing past causes. In addition, he suggests that the law of cause and result cannot be used to demonstrate "immutability" because only ultimate thusness (or "immutable continuity") is permanently immutable, while the law of cause and result applies only to dependently arisen things in the "three time periods" (that is, the phenomenal world).
It is worth noting that Zhencheng mainly cites sūtras revered by the Huayan and Yogācāra schools, not Madhyamaka scriptures, in his analysis of the "two kinds of permanence". This is because Madhyamaka texts do not consider thusness as an inner "real and eternal nature". Chinese readers first encountered the concept of Buddha-nature (Buddha-dhātu, foxing 佛性) following the translation of the Mahāyāna Mahāparinirvān . a sūtra in the early fifth century. 40 Two sentences from this sūtra encapsulate its main theme: "All sentient beings possess Buddha-nature. The Tathāgata is always abiding and immutable." 41 The notion of Buddha-nature was then gradually combined with another Buddhist concept-the twofold truth-as well as the indigenous Chinese principle of essence and function (ti yong 體用). This explains why Zhencheng insists that only thusness (the "real and eternal nature") can be categorized as the first kind of permanence-the "immutable continuity" or the "ultimate truth" that is grasped only by the sage. Meanwhile, he argues that the phenomenal world that is restrained by the law of cause and result (that is, the "successive continuity") changes in every instant. This is the "conventional truth" of the world, as understood by unenlightened people.
As we have seen, Seng Zhao completed The Immutability of Things around 410 CE, prior to the translation of the Mahāyāna Mahāparinirvān . a sūtra. Hence, it is hardly surprising that this sūtra exerted little or no influence on his thinking. Instead, in all four of his treatises, Seng Zhao remains entirely faithful to the ideas in the Madhyamaka sūtras that he and his teacher Kumārajīva were translating at the time. To some degree, Zhencheng knew that his approach was different from Seng Zhao's, 39  and he explains their contrasting perspectives with reference to a pair of popular Chinese Buddhist concepts-bore (般若, prajñā) and niepan (涅槃, nirvān . a): The prajñā (sūtras) clarify the forms and manifest emptiness, therefore they state that "dharmas do not leave or come", which means that if one seeks the characteristics of leaving and coming, one cannot grasp them. Thus, prajñā does not manifest permanence. The nirvān . a (sūtras) directly reveal the real nature, so they claim that "permanent abiding is beyond cause and result" [ . . . ] The essence of nirvān . a that abides permanently, and is not empty, is the Buddha-nature and the true self in the womb of the Tathāgata, which is firm and immutable, thus not impermanent. It truly exists with an essence, so it is not empty. The prajñā sūtras do not mention this.
Zhencheng uses bore (般若, prajñā) when discussing the teachings of the Indian Madhyamaka 中觀 派 tradition and the indigenous Chinese Sanlun school 三論宗, and niepan (涅槃, nirvān . a) in reference to theories that largely conform to the doctrines of the Huayan school (i.e., all things originate from thusness). One of the main points of contention between these two traditions is that while niepan scriptures acknowledge the eternal existence of the Buddha-nature in all sentient beings, bore texts tend to negate any eternal essence, including that of the Buddha-nature. 43 Therefore, it seems highly likely that Zhencheng knew that Seng Zhao never intended to equate "immutability" with any kind of essential nature of things, as "the sūtras of prajñā do not mention this". Nevertheless, he criticizes The Immutability of Things on the basis of Huayan reasoning. This may be explained by the fact that Chinese Buddhist thought became preoccupied with niepan thinking after the Sanlun school started to decline at the end of the Tang dynasty (618-907). Indeed, even the Tiantai school 天台宗, which claimed to preserve Sanlun teachings, adopted the theory of intrinsic inclusiveness (xing ju 性具)-that is, the Buddha-nature includes both good and evil-as one of its central tenets.

Figure 2.
A schematic overview of Zhencheng's understanding of impermanence and immutability/permanence. Zhencheng's "proof" of permanence may be summarized as follows: the conditioned things in the dharma-realm of phenomena arise dependently and change in every moment, but as they derive from the emptiness in the dharma-realm of principle (which is similar to the noumenon of thusness in Huayan thinking, Buddha-nature or the true/one/enlightened mind), the phenomenal things share the nature of permanent abiding or the immutability of emptiness. Therefore, the relationship between the noumenon and myriad phenomenal things may be expressed as "all are identical to the one, and the one is identical to all" (一切即一, 一即一切). Within the dharma-realms framework, only emptiness in the realm of principle truly possesses the trait of immutability or permanence; meanwhile, phenomenal things should be seen as "immutable" or "permanent" only in the sense that they encompass and interpenetrate the principle of emptiness.
All of this stands in marked contrast to Seng Zhao's elaboration of Madhyamaka thinking in The Immutability of Things, because he makes no mention of anything like Buddha-nature in his explanation of the phenomenal things. According to Seng Zhao, the only possible methodology leading to emptiness is emptiness itself. This serves to deflect any alternative positive proposition, and ultimately negates any attachment to the concept of emptiness itself. In general, while Seng Zhao uses "immutability" and "mutability" to denote the coexisting and equal characters of all phenomenal things, Zhencheng uses these terms to denote the discrete dharma-realms of principle and phenomena. To the latter's mind, "immutability" has logical priority over "mutability", so he flatly refuses to describe phenomenal things as "immutable".

Contemporary Responses to Zhencheng's Criticism of Seng Zhao
Zhencheng requested feedback from a number of fellow scholar-monks after completing the main part of A Logical Investigation. Unfortunately for him, their responses were generally negative, which marked the start of a fierce debate that continued up to and even beyond Zhencheng's death. As Daoheng 道衡 (n.d.) reported, "After Master Cheng wrote the refutation, there were dozens of venerable masters who refuted his refutation." 46 No more than twenty texts by approximately ten of these monks have survived.
The debate can be divided into two distinct phases, with the first recorded in the second volume of A Logical Investigation, which includes contributions by "a recent master holding a different view (jinshi yijie shi 近世異解師)", "a venerable monk without name ( Deqing. Almost all of these scholar-monks rejected Zhencheng's assessment of Seng Zhao's text. The remainder of this section focuses on the main points of contention raised by Deqing, Haiyin, and Huanyou.

Deqing
Although a member of the Linji branch of Chan 臨濟宗, Deqing, one of the most influential monks of his generation, posited himself against the nominal claims of "orthodox" Chan genealogy of dharma transmission and the iconoclastic style that was popular at the time. The attainment of enlightenment was viewed as the primary condition for Chan practitioners to gain entry into the genealogy, and the decline of the tradition prior to the late Ming was reflected in practitioners imitating and plagiarizing the records of earlier enlightened monks' deeds and proclamations. In a bid to counter this epidemic of fakery, Deqing praised the authenticity of individualistic and specific experience in Chan meditation. Moreover, he suggested combining meditation with other forms of practice, such as Pure Land and doctrinal studies.
Deqing resided for a time with Zhencheng on Mount Wutai, and he entered the debate over A Logical Investigation while the latter was still in the process of preparing his manuscript. As mentioned in the previous section, Zhencheng criticizes The Immutability of Things with reference to the first part of a paragraph from the Huayan jing suishu yanyi chao. By contrast, Deqing's A Brief Commentary on the Zhao Lun (Zhaolun lüezhu 肇論略注) focuses on the second part of Chengguan's analysis, which leads to the conclusion that Chengguan actually "praises (the arguments) expressed (in The Immutability of Things) as they subtly conform to the Buddha's doctrines". 47 Unsurprisingly, given his support for Chengguan's use of the twofold-truth theory, Deqing's defence of Seng Zhao aims to prove that the latter's understanding of "immutability" belongs in the realm of ultimate truth or the 'one mind' (yixin 一心). Indeed, he states that all four of Seng Zhao's treatises "take the one mind as their doctrinal foundation" (所宗本乎一心), as does The Awakening of Faith (Qixin lun 起信論). 48 He also uses this theory in his analysis of Seng Zhao's title: "the wu 物 refers to the myriad dharmas that are observed, and buqian 不遷 refers to the true characteristic of every dharma in the essence"; "every dharma is immutable in the essence. It is not (valid to say that) its characteristic is mutable while its nature is immutable." 49 Later, Deqing suggests that language lacks the capacity to express the "true characteristic" (shixiang 實相) of dharma, because it derives from human consciousness, which rests on false conceptualizations of external things, whereas the true characteristic of dharma is the inconceivable absolute. He presents 46 澄師駁論以, 海尊宿大老, 駁其駁者, 亡十家。 CBETA 2020.Q1, X54, no. 878, p. 910b8-9; R97, p. 725a2-3; Z 2:2, p. 363a2-3. 47 推其所見妙契佛義也. CBETA 2019.Q3, X54, no. 873, p. 336c21-22; R96, p. 590b6-7; Z 2:1, p. 295d6-7. 48 CBETA 2019.Q3, X54, no. 873, p. 330c9-11; R96, p. 578a12-14; Z 2:1, p. 289c12-14. The Awakening of Faith is one of the most influential texts on the subject of Buddha-nature theory. It defines the "one mind" as the origin of the world, and explains that it has two aspects-a thusness aspect (zhenru men 真如門) and an arising and ceasing aspect (shengmie men 生 滅門)-with the former manifested by the latter. In this sense, the relationship between the two aspects is similar to that between the two truths. 49 物者。指所觀之萬法。不遷。指諸法當體之實相; 法法當體本自不遷。非相遷而性不遷也。 CBETA 2019.Q3, X54, no. 873, p.
332b6-11; R96, p. 581b3-8; Z 2:1, p. 291b3-8. several well-known cases (gong'an) of prominent monks comprehending the true characteristic of dharma through the direct experience of intuition, then criticizes those who "adhere strictly to the Buddha's teachings expressed in written words". 50 Of course, Zhencheng falls into the latter category, as he routinely cites the "teachings of the sage" and "logical inference" in support of his arguments.
Deqing implies that such an approach is counter-productive, as immutability in the nature of things can be grasped only through personal experience. He then describes how he himself came to comprehend immutability in the nature of ever-changing things: Suddenly, the wind blew the trees in the courtyard, and the fallen leaves flew in the air. But I did not see any leaf moving. Ah, there is faith in "the raging storm that uproots mountains in fact is calm". Then (I) went to the toilet to relieve myself, but could not see any characteristic of "flowing". (I) exclaimed, "It is true, indeed! The two rivers of China (i.e., the Yangzi and the Yellow River) rush along and yet do not flow." 忽風吹庭樹。落葉飛空。則見葉葉不動。信乎。旋嵐偃嶽而常靜也。及登廁去溺。則不見流 相。歎曰。誠哉。江河競注而不流也。 51 Clearly, Deqing believed that personally experiencing immutability amid conditional things that, at first glance, seem to be changing rapidly is a far more persuasive demonstration of the concept than any amount of rational reasoning based on the study of scriptures. Although he never belittled doctrinal study, he always insisted it was supplementary to meditation. For example, his treatises on the subject of Yogācāra philosophy include such caveats as: (Those who read this) should just enlighten their minds with the help of this treatise, instead of specifically differentiating the names and characteristics.

正要因此悟心。不是分名相也。 52
Those who practice meditation do not need to read Buddhist doctrines widely. With this treatise, they can verify (their state of) mind in order to prove the depth of their enlightenment.

而参禅之士不假涉教義。即此可以印心。以証悟入之深。 53
Deqing succeeded in assimilating Yogācāra analysis of consciousness with the Chan theory of the one mind. This not only simplified the highly complicated Yogācāra teachings, but also provided much-needed guidance for Chan practitioners as they attempted to enlighten their minds in everyday life.
Haiyin repeatedly emphasizes that Seng Zhao views conventional things, not the truth, as immutable. Zhencheng then confirms this interpretation in his response to Haiyin's letter: "Great Master Haiyin wisely wrote thousands of words in the letter, but his main point is that Master Zhao proposed immutability based on conventional things, rather than proved the immutability of thusness." 55 Haiyin comes close to identifying the crux of Seng Zhao and Zhencheng's disagreement on the basis of the twofold-truth theory: that is, is it acceptable to use "immutability" in reference to conventional/phenomenal things (i.e., the opposite of "mutability") or is it only ever applicable to the ultimate truth of emptiness (or thusness, Buddha-nature or one mind)? However, his analysis is constrained by the strict structural separation of the conventional and ultimate truths in Huayan philosophy, which prevents a Madhyamaka-inspired exploration of the relationship between these two truths. Zhencheng seizes on this limitation to rebut Haiyin's critique.
He then tables three questions for Haiyin's consideration: if conventional things are immutable, is it because the conventional things are identical to (i.e., share the nature of) the truth and therefore are immutable? Or is it because they are not identical to the ultimate truth, and are thereby immutable? If conventional things are identical to the ultimate truth and therefore are immutable, then the ultimate truth is immutable, and this hypothesis certainly offends against the truth. If conventional things are not identical to the truth, and one states that they are immutable, then this does not go beyond the two notions (i.e., understanding) [of Hīnayāna or Abhidharma]. Firstly, claiming that conditioned phenomena are vanishing in an instant, then they do not move to another place from this place; this is the correct understanding according to Hīnayāna. Secondly, stating the nature of each thing is abiding, then past things do not disappear (lit. transform). Then the nature abides in the past and therefore is immutable. This is the eternalist view of the heretics. 56 Haiyin, along with most of Zhencheng's Chan opponents, also criticizes him for obsessively focusing on a few specific words in The Immutability of Things, seemingly with little regard for Seng Zhao's overall intent. In his defence, Zhencheng refers to the relationship between "word" (yan 言) and "meaning" (yi 意)-a recurring Chinese philosophical concern since the Neo-Daoist era. He argues: "Words are the traces of the mind, and the mind is the origin of the words. It is called such 'since (their) minds appreciate the non-existence, when encountering something (they) often speak in a way of obeying the non-existence'. Thus, by comprehending somebody's words, (you will) certainly comprehend his mind; based on the traces, (you will) understand the origin." 57 Following 54 CBETA 2019. Q3, X54, no. 879, p. 924a21-b5; R97, p. 752a10-18; Z 2:2, p. 376c10-18. 55

Huanyou
For many years, another of Zhencheng's critics, Huanyou, was widely regarded as the leading dharma heir of the Linji master Xiaoyan Debao (笑嚴德; 1512-1581), not least because several of his own disciples played key roles in the revival of the Linji branch. Notwithstanding recent challenges to this designation (Jiang 2008, pp. 301-6), Huanyou was certainly an erudite scholar, as his correspondence with Zhencheng testifies.
Unfortunately, Zhencheng did not include any of Huanyou's correspondence in his "Reply to Chan Master Huanyou" 答幻有禪師書 in A Logical Investigation, so most of our insights into the latter's thinking are based on his treatises. 59 The two men's debate revolved around the relationship between xingzhu 性住 ("nature abides") and xingkong 性空 ("emptiness of nature"): while Zhencheng insisted that these two ideas are "contradictory and conflict with each other" (diti huwei 敵體互違), Huanyou believed that they are "an integrated body of the true characteristic" (yiti shixiang一體實相). The latter built his case by dissecting three of Zhencheng's main points of contention in A Logical Investigation. Each of these is examined in turn below.

a.
Challenge the application of the twofold-truth theory and Zhencheng's interpretation of "immutability" As we have seen, there is a subtle contradiction in Chengguan's appraisal of The Immutability of Things in the Huayan jing suishu yanyi chao. On the one hand, he insists that the theory of twofold truth should be used only to distinguish The Immutability of Things from another of Seng Zhao's treatises, Oń Sūnyatā, as it is only in the latter that Seng Zhao explains the concept of emptiness or the ultimate truth. On the other hand, he states that The Immutability of Things "regards the ultimate truth as immutability, while not showing the characteristic of the ultimate truth", which seems to imply that "immutability" does precisely denote the ultimate truth. In other words, Chengguan is rather ambivalent on the question of whether "immutability" equates to the ultimate truth. By contrast, Huanyou is certain that The Immutability of Things is concerned solely with the realm of conventional truth.
Furthermore, Huanyou points out that Seng Zhao never violated the teaching of emptiness, even though he used the notion of immutability to "correct" unenlightened people's attachment to mutability through the expedient means (upāya) of conventional language and concepts. Once again, this comment could be interpreted as a mild rebuke of Chengguan, on the grounds that he was such a staunch advocate of immutability that he strayed from the Middle Way of emptiness, which aims to eliminate all attachment (including attachment to the notion of immutability).
As discussed earlier, Chapter 2 of the MMK divides the concept of "movement" into three distinct elements: the mover, the moving time, and the act of moving. Huanyou mirrors this technique by dividing "nature abides in one time period" into the thing, the abiding time, and the act of abiding. Then, in another nod to Nāgārjuna, he explains that the thing and the abiding time depend on each other. Furthermore, he confirms that the "nature abides in one time period" concept accords with the "eight negations" by addressing each of the latter in turn: first, nothing comes from outside of a time period, so the concept conforms to "non-appearance" (bu lai 不來); second, nothing is able to free itself from the restriction of a time period, so it also conforms to "non-disappearance" (bu qu 不去); third, as the time and the thing are interdependent, they are different yet linked, so their relationship accords with both "non-identity" (bu yi 不一) and "non-difference" (bu yi 不異); fourth, as the time and the thing are inextricably bound to each other, neither can arise independently or last permanently by itself, and neither can be destroyed or cease if the other continues to exist, so their existence conforms to "non-arising" (bu sheng 不生), "non-ceasing" (bu mie 不滅), "non-annihilation" (bu duan 不斷), and "non-permanence" (bu chang 不常). According to Huanyou, the essence of these eight negations is inherently coherent as they are rooted in the "one reality of the uncreated" (wusheng yishi 無生一實). 64 Huanyou elaborates on some other valuable ideas in his personal discourse records. For example, he argues that relative and opposite conceptions are restricted to the conventional world, while the ultimate truth is beyond all relativity. 65 Therefore, it is inappropriate to use the term "immutability"-the opposite of conventional things' "mutability"-to denote the ultimate truth. In other words, any differentiation between mutability and immutability must be confined to the realm of phenomena. Nevertheless, Huanyou found it impossible to shed his Huayan and Chan Buddhist background entirely, or to comprehend Seng Zhao's treatise in purely Madhyamaka terms. This is especially evident during his discussions of the concept of the mind, 66 and when he draws parallels between "mysterious comprehension" (shenhui 神會) in The Immutability of Things and "subtle contemplation" (miaoguan 妙觀) in Chan meditation. 67 In summary, all three of the scholar-monks discussed here challenged Zhencheng's assessment of The Immutability of Things for the same three reasons. First, they all believed that the theory of twofold truth was key to resolving the "nature abides" (Seng Zhao)/"emptiness of nature" (Zhencheng) conflict. Second, on the issue of "words and meanings", while Zhencheng insisted that words are an effective means through which authors are able to communicate their ideas, his Chan rivals felt that full comprehension of meaning cannot be achieved merely by reading an author's words in a text. Finally, Zhencheng was a devotee of Yogācāra formal logic and the Huayan theory of the "four dharma-realms", whereas most of his opponents favored direct awareness and meditation practice. Huanyou was an exception, as his analysis was based on the dialectical method and the "eight negations" of the MMK, one of the main Madhyamaka sūtras.
In short, Zhencheng attempted to resolve late Ming Buddhism's legitimacy crisis through doctrinal study, Deqing preferred meditation, and Huanyou felt that a combination of the two was the best course of action.

Conclusions
There were two crucial philosophical developments in Chinese Buddhism and Neo-Daoism in Seng Zhao's lifetime: the "six houses and seven schools" of Buddhism's deliberations on how to understand the term "emptiness"; and Wang Bi and Guo Xiang's in-depth metaphysical explorations of the concepts of "existence" (you 有) and "non-existence" (wu 無). In his treatises, Seng Zhao skilfully utilized the wisdom of the Madhyamaka Middle Way to transcend the Neo-Daoist dualistic assumptions of you and wu; meanwhile, he also clarified the discussions among the "six houses and seven schools" by interpreting "emptiness" on the basis of "dependent arising". Embedded within this febrile intellectual atmosphere, he wrote The Immutability of Things with the dual aims of proving the coexistence of stillness and movement in the phenomenal world, and transcending the extreme concepts of mutability and immutability.
The Chinese philosophical community was no less turbulent more than a thousand years later, when Zhencheng composed his fierce critique of Seng Zhao's treatise. Buddhism was enjoying a significant revival after a long period of decline as a result of the generous patronage of the imperial court, but it was also embroiled in a crisis of legitimacy due to the lengthy suspension of Buddhist traditions. A remedy was clearly necessary, but Buddhist scholars could not agree on the best approach: some advocated authentic enlightenment through meditation, while others felt the answer could be found in detailed analysis of the ancient scriptures. Zhencheng was a typical late Ming Huayan scholar-monk. Although guided by the doctrines of his own school, he also made full use of Yogācāra argumentation and formal logic techniques to challenge Seng Zhao's ideas. Specifically, with reference to Buddha-nature, the twofold truth and the four dharma-realms, he highlighted what he viewed as three major flaws in The Immutability of Things: (1) immutability cannot prove permanence; (2) Seng Zhao's use of "existence" and "non-existence"; and (3) a break in the logical chain that connects the cause to the result.
A host of Zhencheng's contemporaries subsequently voiced their opposition to his analysis, most notably Deqing, Haiyin, and Huanyou. Each of these scholar-monks offered a fresh interpretation of "immutability" on the basis of the theory of the twofold truth. In particular, Huanyou advanced the debate by clarifying some key terms, scrutinizing the law of cause and result and exploring the theory of twofold truth itself, mainly through use of the dialectic method and with reference to the "eight negations". However, all of these "opponents" were more or less rooted in the doctrine of Buddha-nature, just as Zhencheng was, so they were unable to comprehend The Immutability of Things purely in the framework of Madhyamaka discourse.