What the school taught
The Sarvāstivāda — the doctrine that all (dharmas) exist — was the dominant Buddhist school of north India between roughly the second century BCE and the seventh century CE. Its base of operations was Kashmir and Gandhāra; its great commentarial project was the Mahāvibhāṣā, the Great Exegesis, compiled around the second century CE under the patronage of the Kuṣāṇa king Kaniṣka. The school's defining technical claim — the one that earned the name — is that the dharmas, the irreducible momentary constituents into which the Abhidharma analysed all experience, exist in all three times: the present dharma is undeniable, but the past dharma that has just ceased and the future dharma that has not yet arisen are also real entities, not merely names for the absence of present arising. The thesis is a metaphysical answer to a problem internal to the doctrine of dependent origination: if a present moment is conditioned by a past moment, that past moment must in some sense be available to do the conditioning.
Why the school mattered
The Sarvāstivāda mattered because it produced the most ambitious systematisation the early Buddhist tradition ever attempted of its own doctrines. The Mahāvibhāṣā, and the later Abhidharmakośa of Vasubandhu (fourth or fifth century), catalogued the seventy-five dharmas into which experience could be reduced, distinguished the conditioned from the unconditioned, and worked out a theory of causation in which six causes and four conditions operated across all three times to produce the moment-to-moment arising of phenomena. *The Essentials of Buddhist Philosophy*, Junjirō Takakusu's mid-twentieth-century English-language survey, devotes its chapter on the Sarvāstivāda to the Abhidharmakośa and treats the school's analysis as the technical floor on which every later Indian Buddhist scholastic system, Mahāyāna included, was built. Whether one accepts the metaphysics or not, the Sarvāstivāda literature is the place where Buddhist philosophy first became philosophy in the European sense — discursive, systematic, argumentatively articulated, committed to its own demonstrative apparatus.
How the Mahāyāna defined itself against it
The early Mahāyāna schools both inherited Sarvāstivāda technical vocabulary and rejected its central thesis. Nāgārjuna's Mūlamadhyamakakārikā — the second-century foundational text of Madhyamaka — argues that no dharma, whether past, present or future, has *svabhāva* (inherent nature); the entire Sarvāstivāda edifice of three-time realism collapses on the prior question of whether anything can be said to exist in its own right at all. Vasubandhu's Abhidharmakośa itself is divided: he wrote the verses as a faithful exposition of the Sarvāstivāda and then appended his own prose commentary defending the Sautrāntika alternative — the school that accepted the Abhidharma analysis but denied the metaphysical reality of past and future dharmas. *The Awakening of Faith in the Mahāyāna* — a text whose Indian or Chinese provenance remains contested — moves the centre of gravity entirely, reframing the Sarvāstivāda world of conditioned phenomena as the surface of a single underlying tathatā (suchness) rather than as a real plurality.
Where to encounter it in the index
No primary Sarvāstivāda text is currently a row in the index. The school's footprint is best traced through the volumes that take its analyses as their point of departure. Takakusu's *The Essentials of Buddhist Philosophy* is the most direct: a chapter-by-chapter survey of the major Indian Abhidharma and Mahāyāna systems organised around the Abhidharmakośa, written for English-language students who had no Sanskrit. *The Awakening of Faith in the Mahāyāna* is the Mahāyāna counter-text — the one that has historically been read as the moment the East Asian Buddhist tradition stepped out of the Indian scholastic frame the Sarvāstivāda had built. Thich Nhat Hanh's teaching on emptiness, signlessness and aimlessness and his longer-form teaching on true Buddhist teachings carry the Mahāyāna response into contemporary practice register; the Sarvāstivāda is the unspoken interlocutor the vocabulary of emptiness and svabhāva arose in dialogue with. Joseph Goldstein's *Mindfulness* and the Goldstein–Salzberg *Insight Meditation* course carry the parallel-channel response of the Theravāda: a different Abhidhamma, the same family argument about how to inventory experience without producing exactly the kind of metaphysical entities the Buddha was held to have refused.
What it isn't
The Sarvāstivāda is not Theravāda. The two schools share an Abhidharma analytical method and treat the Buddha's disciples as the systematisers of the canonical lists, but the texts are different and the doctrinal commitments diverge: the Theravāda's Pāli Abhidhamma works in seven different books from the Sarvāstivāda's, and it does not assert the existence of past and future dharmas in the Sarvāstivāda sense. It is also not extant as a living school. The Sarvāstivāda did not survive the late-first-millennium contraction of Buddhism in India; its inheritance survives doctrinally — in the technical vocabulary every later Indian and East Asian Buddhist system uses — and textually, in the Chinese translations of its canon that Xuanzang and others brought back from India in the seventh century. The school is best read today as the scholastic floor against which the Mahāyāna built its own ceilings, and as the standing reminder that Buddhist philosophy in the technical sense is a real intellectual project rather than only a set of contemplative instructions.
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