Brahma Sūtra

The Upaniṣads are many, composed in different schools, and they say apparently different things. The Brahma Sūtra is the attempt to show that they say one thing — and it is written so tersely that its meaning is genuinely underdetermined, which is why the great schools of Vedānta could each claim it.

The four adhyāyas

The four sūtras that carry the whole

The first four aphorisms — the catuḥsūtrī — are the most commented-upon dozen words in Indian philosophy. Śaṅkara's introduction to them alone runs longer than many complete treatises.

Both particles are contested and neither is decorative. Atha — 'now' — implies a preceding qualification, and what it is decides the whole shape of the system: for Śaṅkara it is the fourfold discipline (discrimination between eternal and non-eternal, dispassion, the six virtues, and the desire for liberation); for Rāmānuja it is the study of the Veda; for Mīmāṁsakas reading the two Mīmāṁsās as one work, it is the prior completion of the enquiry into dharma. Ataḥ — 'therefore' — asserts that something in what precedes makes this enquiry necessary. And jijñāsā is a desiderative noun: not knowledge of Brahman but the desire to know Brahman. The text begins by naming a want, not a doctrine.

Three words defining the subject of the entire treatise, and they define it by function rather than by description. Janmādi — 'origin and the rest', meaning origin, sustenance and dissolution. Brahman is not characterised by any quality here but as that from which the world's arising, standing and ending proceed. This is a taṭastha-lakṣaṇa, a definition by an accidental mark, and the tradition says so explicitly: it identifies Brahman without stating its nature, in the way one may identify a house by the crow currently sitting on it. The essential definition, svarūpa-lakṣaṇa, has to come from śruti — which is exactly what the next sūtra says.

The compound is genuinely ambiguous and the tradition exploits the ambiguity in both directions. Read one way — scripture is the means of knowing Brahman — it is an epistemological restriction: Brahman is beyond perception and inference, therefore only śabda can establish it. Read the other way — Brahman is the source of scripture — it is the Bṛhadāraṇyaka's breathing-out. Śaṅkara accepts both readings in sequence, and the acceptance is not evasion: if Brahman is the source of the Veda and the Veda is the only means of knowing Brahman, then the circle is the doctrine, and the fourth sūtra closes it by insisting that Brahman is what the Upaniṣads are actually about — tat tu samanvayāt.

The limits of reasoning, and the last word

In the second chapter, defending the Upaniṣadic position against Sāṅkhya and the Buddhist schools, Bādarāyaṇa states why philosophy alone cannot settle the question.

The argument, expanded by the commentators, is that for any chain of reasoning a cleverer reasoner can produce a counter-chain, and there is no reasoning that establishes the impossibility of a better argument tomorrow — a point about the perpetual defeasibility of inference that is neither anti-intellectual nor obsolete. It is the same conclusion the Yakṣa gets from Yudhiṣṭhira. Yet the text does not therefore abandon reasoning: it is itself a work of sustained argument, chapter two is nothing but argument, and Śaṅkara insists that reasoning is indispensable in support of śruti. What is denied is reasoning as an independent means of settling a question about what lies beyond perception.

And the work ends in two words, which are also the tradition's answer to whether liberation can be lost.

Anāvṛtti — non-return. A text that opens with a desire to know closes by saying that what is reached is not lost again, and it grounds even that on śabda rather than on argument, which is consistent with 2.1.11 to the last word. The whole system is bracketed between a wanting and a not-returning.

The commentaries are the schools

॥ ❖ ॥

Last revised 2026-08-16. Corrections are welcome — see how this site is written.