Pramāṇa

What it asks

A pramāṇa is an instrument that produces a true cognition: not a justification offered after the fact, but the means by which knowing occurs. The organising question of the field is therefore a counting question. How many such instruments are there, and can any of them be reduced to another?

That question sounds procedural and is not. To accept testimony as an independent instrument is to accept that some things are known because they were reliably said, which has consequences for scripture, for law and for what a philosopher is allowed to argue from. Every school's list is a position on what may be taken as given.

The recurring problems

The count. Cārvāka materialists accepted perception alone. The Buddhist logicians accepted two, perception and inference. Sāṃkhya accepted three, adding testimony. Nyāya accepted four, adding comparison. The Mīmāṃsakas went to six, adding postulation and non-apprehension — the last being the means by which one knows an absence, as when one sees that the jar is not on the floor.

Self-validation. If a cognition needs another cognition to certify it, the certification needs certifying. Mīmāṃsā answered that cognitions are valid on their own until defeated; Nyāya answered that validity is established from outside. The dispute is the Indian form of the regress problem, and it was pursued with more precision than the parallel European debate for several centuries.

Inference. Indian logicians analysed inference in terms of pervasion — the relation that must hold between smoke and fire for the smoke to license the conclusion — and the problem of establishing pervasion without circularity generated a technical literature of great difficulty.

How it developed

The Nyāya Sūtra, attributed to Akṣapāda Gautama and dated to roughly the second century, sets out four instruments and a framework for debate. Vātsyāyana's commentary makes it a working system.

The decisive development is Buddhist. Dignāga, in the fifth or sixth century, reduced the instruments to two and redefined perception as free of conceptual construction — a cognition of the bare particular, with everything else the work of thought. Dharmakīrti extended and defended this in the seventh century, and the resulting position was the one every other school then had to answer.

The reply came slowly and then decisively. Gaṅgeśa's Tattvacintāmaṇi, in the fourteenth century, founded Navya-Nyāya — the new logic — and developed a technical vocabulary for stating conditions with such precision that it was adopted across Indian disciplines, including grammar and law, and remained in use into the eighteenth century.

The positions within it

Nyāya, Mīmāṃsā, Sāṃkhya, Cārvāka, the Buddhist logical tradition and Navya-Nyāya are schools, and are covered in that section. What belongs here is the shared framework they disputed within: that knowledge is analysed by identifying its instruments, and that a philosophical position is stated by listing which ones it accepts.

Where it stands now

The tradition was largely unknown in European philosophy until the twentieth century, and its reception is recent enough that the standard translations are still argued over. Comparative work has focused on the places where the two traditions converge without contact — the Indian treatments of testimony and of absence are frequently better developed than their Western counterparts — and on the places where they do not converge at all, which are more instructive.

The framework is included here on its own terms rather than as Indian epistemology. Translating it that way imports the assumption that justification is the central question, and in this tradition it is not.