The Catuḥsūtrī — the first four sūtras

Why four sūtras carry the whole work

The tradition treats the first four sūtras as a complete statement of Vedānta, and the other 551 as its application. Read together they answer the four questions any teaching must settle before it begins — the anubandha-catuṣṭaya: who is fit for it (adhikārin), what it is about (viṣaya), what it gives (prayojana) and how its subject is related to the text (sambandha). The first sūtra names the qualified seeker and the goal; the second defines the subject; the third names the only means of knowing it; the fourth shows that the Upaniṣads, all of them, are about it.

So much was packed into these four that commentaries on them alone fill volumes — Śaṅkara’s bhāṣya on the first four sūtras is a quarter of his whole commentary on the first pāda, and the sub-commentaries (Padmapāda’s Pañcapādikā, Vācaspati’s Bhāmatī) devote most of their length to them.

Before the first sūtra: adhyāsa

Śaṅkara begins not with the sūtra but with a preface on superimposition (adhyāsa). The subject (“I”, consciousness) and the object (“this”, the body, mind and world) are as opposite as light and darkness, yet everyone mixes them up: “I am fat”, “I am tired”, “this is mine”. Superimposition is “the appearance, in the form of memory, of something previously seen, in some other thing” — as a rope is seen as a snake, or one moon as two.

This mixing is beginningless and natural, and every activity — perception, ritual, scripture itself as a guide to action — takes place within it. Its removal by knowledge is called vidyā; the Upaniṣads are begun “to destroy this cause of evil and to attain the knowledge of the unity of the Self”. The whole Brahma Sūtra, read this way, is the systematic undoing of one confusion.

Sūtra 1 — the fourfold fitness

“Now” (atha) means “after a definite preparation”, and Śaṅkara names it — the sādhana-catuṣṭaya:

1. viveka — discrimination between the lasting and the passing;
2. vairāgya — dispassion towards enjoying the fruits of action here and hereafter;
3. śamādi-ṣaṭka-sampatti — the six treasures: calm of mind (śama), control of the senses (dama), withdrawal (uparati), forbearance (titikṣā), faith (śraddhā) and collectedness (samādhāna);
4. mumukṣutva — the longing to be free.

With these, the enquiry can begin even without a previous study of ritual; without them, it does not really begin even after it. “Therefore” (ataḥ): because the Veda itself teaches that what is gained by action perishes (“as here the world gained by work perishes, so there the world gained by merit perishes”, Chāndogya 8.1.6), while “the knower of Brahman attains the highest” (Taittirīya 2.1).

Sūtra 2 — two kinds of definition

A thing can be defined by its essential nature (svarūpa-lakṣaṇa) or by an incidental mark that points to it (taṭastha-lakṣaṇa) — the house “with the crow on the roof”. 1.1.2 is of the second kind: Brahman is that from which the world comes, in which it lives, into which it returns. The Upaniṣad gives the first kind: satyaṃ jñānam anantaṃ brahma, existence, consciousness, infinitude.

Why use a pointer at all? Because the seeker begins in the world. The world is the most obvious fact we have; by tracing it to its cause we are pointed to a reality that is not itself a thing in the world — and then the essential definition can be understood. The order of the sūtras is the order of teaching.

Sūtra 3 — why scripture?

Brahman cannot be perceived: it has no form, colour or sound, and is the perceiver itself. It cannot be inferred: inference needs an observed link between a sign and the thing signified (smoke and fire), and Brahman, being one without a second, has never been observed in any such link. The world shows that there is a cause; it does not show that the cause is conscious, one, and one’s own Self. Only the Upaniṣad can teach that.

This is not a rejection of reasoning. The second adhyāya is reasoning from beginning to end. But reason works on what the scripture teaches — removing doubts, showing consistency, answering objections — rather than reaching the truth by itself (2.1.11). The other reading of the sūtra — Brahman as the source of the Veda — completes the circle: the means of knowing Brahman comes from Brahman.

Sūtra 4 — the harmony, and the six marks of purport

How do we know what a text is about? The Mīmāṃsā tradition gives six marks, and Vedānta applies them to the Upaniṣads. In Chāndogya 6, for example: it begins and ends with Being (“In the beginning there was only Being” … “All this has that for its Self”); the teaching “you are That” is repeated nine times; the subject is new — known from no other source; a result is stated (“he waits only till the body falls”); there is praise (“by which the unheard becomes heard”); and reasoning supports it (clay, gold, iron).

The Mīmāṃsaka objects that scripture only commands. Bādarāyaṇa’s tu (“but”) rejects this: knowledge of a thing that exists depends on the thing, not on anyone’s will; it cannot be commanded. Mokṣa is not a result of action — that would make it perishable — but the nature of the Self, revealed when ignorance is removed. This is the hinge on which the Brahma Sūtra turns: tat tu samanvayāt.

How the schools read the four