The Tathāgatagarbha, Named at Last

Jizang's coming-intent analysis ties this chapter directly to what came before: practice cannot arise without a supporting object, so once Chapter Five has established the One Vehicle as practice's fruit, the text must next establish the principle that practice actually rests on — the noble truths. More specifically, since the One Vehicle depends on the tathāgatagarbha, and the tathāgatagarbha only becomes manifest through the four truths, "the One Vehicle depends on the tathāgatagarbha, and the tathāgatagarbha is made manifest through the four truths — hence the truths must be explained" (一乘依如來藏，如來藏由四諦而顯，故須明諦也). The chapter also has a polemical edge: it refutes śrāvakas who take the provisional four truths of the first turning of the wheel as the final word.

On "vajra-like wisdom," Jizang gives two complementary glosses: the Tathāgata's wisdom is permanent, "not destroyed by arising and ceasing," comparable to vajra's own indestructibility; and vajra destroys everything without residue, symbolizing that this wisdom alone can sever the ignorance-dwelling-ground completely, reaching all the way to the unconditioned truth rather than resting content with the conditioned four truths. He records, and sets aside, an alternate reading that takes "vajra" as naming the Buddha's own śūraṅgama-samādhi at the moment of his enlightenment, preferring instead the reading built on permanence and completeness.

Jizang reports a real, unresolved disagreement over exactly where this chapter — barely six lines in the sūtra itself — actually begins. A "more recent lecturer" (晚講人) places its start one clause earlier than the traditional reading; the older, traditional reading keeps that clause inside the noble-truths chapter, since its stated topic isn't finished yet, and warns that pulling tathāgatagarbha and dharmakāya material out early would leave the chapter "jumbled" (雜亂); and a third view, from a Jiangnan master named Min, ties a different clause to the theme of "emptiness concealing" borrowed from the Nirvāṇa Sūtra's milk-and-cream simile — a reading Jizang rejects on textual grounds, since the relevant passage never actually mentions "emptiness concealing" and is really about the dharmakāya's inseparability, not about buddha-nature directly. His own resolution treats Chapters Six through Eight as one continuous unfolding of a single reality — the cessation-truth — described first as itself, then as dharmakāya, then as tathāgatagarbha: "one substance, different meanings" (體一義異).

On why this meaning is "not the domain of thought," Jizang correlates the sūtra's phrases with the classical scheme of wisdoms: what is "subtle" lies beyond the wisdom gained from hearing; what is "hard to know" lies beyond the wisdom gained from reflection; what is "not the domain of thought" lies beyond ordinary cultivated wisdom; and only "what the wise know" reaches the wisdom of direct realization. Hence, in his own summary, "those with the three [ordinary] wisdoms still cannot know it; those without any of the three cannot even believe it" (有三慧者不知、無三慧者不信) — only a buddha, "wise, awakened, and seeing," truly knows and sees it. He also gives three separate reasons this teaching counts as "deep": saṃsāra itself is the tathāgatagarbha, which he supports with the Avataṃsaka's "mind, buddha, and sentient beings — these three are without distinction"; a sentient being's own body is identical with the dharmakāya; and the noble truth is itself the one true truth, "neither suffering, nor origin, nor cessation, nor path" — depth's own extreme.

Jizang offers four complementary lenses for the conditioned/unconditioned distinction: coarse phenomenal birth-death against subtle transformational birth-death; truths covering only ordinary saṃsāric causation against truths covering both ordinary and transformational causation; the shallower realization of schools that know only conditioned arising and the self's own emptiness against the Mahāyāna's full realization of the tathāgatagarbha; and knowing the four truths only in gross aggregate against knowing their infinitely differentiated particulars — "knowing a single instance of suffering, and thereby knowing suffering as numerous as the specks of dust in the whole dharma-realm" (知一苦中，具知法界微塵數苦). He locates the real dividing line in whether realization is self-attained: the conditioned truths are for those who still depend on being taught by another, while the unconditioned truths are known entirely "through the Tathāgata's own power" (如來自力故知).

On "cessation of suffering" as something positive rather than a mere subtraction, Jizang draws a sharp line against the śrāvaka's own "annihilative cessation" — what he elsewhere calls, bluntly, "ashes-and-extinguished-cognition" (灰身滅智) — which he treats as inferior and only provisional. The Mahāyāna cessation he glosses term by term: "without beginning," because principle-cessation was never newly produced by any cause; "without arising, inexhaustible," because what was never falsely brought into being cannot truly perish into nothing; "inherently pure by its own nature," an intrinsic purity present even while still concealed. He backs this with a citation from the Great Perfection of Wisdom Sūtra: "if a dharma existed before and does not exist after, the buddhas and bodhisattvas would themselves bear a fault" — true cessation, in other words, cannot be simple destruction, on pain of implicating the buddhas in a kind of cosmic loss.

Jizang's central move across all three chapters is the identity he draws between dharmakāya and tathāgatagarbha: "the tathāgatagarbha and the dharmakāya are not two things at all — they are merely names for what is concealed and what is manifest. Concealing the dharmakāya, it is called tathāgatagarbha; manifesting the tathāgatagarbha, it is called dharmakāya" (如來藏之與法身更無有二，只是隱顯之名，隱法身故名如來藏、顯如來藏故名法身). He immediately qualifies this against a subtler danger — reifying the very distinction he has just drawn: from the standpoint of true principle, there is never any actual concealing or manifesting going on at all; "concealment conceals nothing real, and manifestation manifests nothing real" (隱實無所隱，顯實無所顯) — these are only descriptions tracking a being's own delusion or awakening, never real changes undergone by the thing itself. He puts the whole three-chapter arc together as a single nested unfolding of the cessation-truth: first stated as itself, then, viewed as the aspect that has emerged from its wrapping, called dharmakāya; then, viewed as still wrapped in affliction, the identical reality is called tathāgatagarbha — one thing, three descriptions, each answering to how far a given listener has traveled toward seeing it clearly.