Akṣapāda Gautama

Key ideas

1. Sixteen categories of inquiry. The first aphorism says that supreme felicity comes from knowing the true nature of sixteen categories, beginning with the means of knowledge and the objects of knowledge and ending with the rules of debate. The list is a table of contents for the whole text: epistemology, metaphysics, the elements of inquiry and the theory of debate.
2. Four means of knowledge. There are four pramāṇas: perception, inference, comparison and testimony. Each is defined in the first book, and the Nyāya school holds that these four are the only irreducible sources of knowledge.
3. Testimony from a reliable speaker. Testimony is the instructive assertion of a reliable person (an āpta), which Vātsyāyana’s commentary takes to be someone who knows the matter and wants to convey it without deception. Nyāya resists the view that testimony is just inference, since the conditions for each differ.
4. A self distinct from the body. Desire, cognition, pleasure and pain are qualities, and qualities need a substance to belong to, which cannot be the body or the senses. Memory over time and recognition across the senses are given as further reasons to posit one persisting self.
5. Realism and trust before doubt. The world is real and perceived directly, composite things are more than heaps of parts, and doubt should itself have a reason. Error and doubt make sense only against a background of true cognition, so inquiry begins by taking cognition at face value.
6. Debate as a discipline. The Nyāya Sūtra distinguishes honest discussion (vāda) from wrangling (jalpa) and cavil (vitaṇḍā), and catalogues fallacious reasons, quibbles, futile rejoinders and the points at which a disputant loses. Much of its length is a handbook of argument.
7. Release through knowledge. Release is the absolute deliverance from pain, and the first aphorisms link it to right knowledge of the categories. The sūtras also recommend yogic practice and defend the possibility of enlightenment.

Akṣapāda Gautama (Akshapada Gautama, also Gotama) is the traditional author of the Nyāya Sūtra, the founding text of Nyāya, the Indian school of logic and epistemology. The text opens with sixteen categories of inquiry, defines four means of knowledge, the pramāṇas, and treats debate as a discipline with rules. This Gautama is not the Buddha, who shares the name, nor the Jain disciple Indrabhūti Gautama.

Who was he, and when did he live?

Nobody can say. His biography is unknown, Gautama was a very common name, and the text may be the work of several authors over time. He is also called Gotama, Dīrghatapas (“of long austerity”) and Akṣapāda (“having eyes in the feet”). A legend, retold in Vidyabhusana’s 1913 translation, explains the last name: Gautama was so absorbed in thought that he fell into a well, and God gave him eyes in his feet.

The Nyāya Sūtra is the oldest extant Nyāya text. The Stanford Encyclopedia dates it to about the second century CE and says some place its redaction in the third; the Internet Encyclopedia of Philosophy gives about 200 CE; other estimates run back to the sixth century BCE. The earliest surviving commentary is Vātsyāyana’s, from perhaps the fifth century.

What is in the Nyāya Sūtra?

The first aphorism, in Vidyabhusana’s translation, says: “Supreme felicity is attained by the knowledge about the true nature of sixteen categories”. They run from the means and objects of knowledge, through doubt, purpose, example, tenet, the parts of an argument and hypothetical reasoning, to the three kinds of debate, fallacious reasons, quibbles, futile rejoinders and the grounds for losing. Epistemology comes first; debate takes up much of the rest, including nearly all of Book 5.

The sūtras are terse, often little more than lists, as the Stanford Encyclopedia notes, so they have always been read through commentaries.

How does it understand knowledge?

The four pramāṇas are perception, inference, comparison and testimony. Perception arises from contact between a sense and its object, and is non-verbal, non-erring and determinate. Inference is preceded by perception and is of three kinds, from cause to effect, from effect to cause, and from what is commonly seen. Comparison is knowing a thing by its likeness to something already known.

Testimony (śabda) is, in Vidyabhusana’s words, “the instructive assertion of a reliable person”. Vātsyāyana’s āpta knows the matter and wants to convey it without deception, and he adds that a foreigner can be one. Nyāya resists reducing testimony to inference, since the conditions for certifying each differ. I draw on this account in my own work on testimony and language models, in What Nyāya Can Teach a Language Model.

The Internet Encyclopedia of Philosophy calls Nyāya epistemology a precursor of process reliabilism. It also holds that doubt should be motivated: error and doubt make sense only against a background of true cognition, so inquiry begins by taking cognition at face value.

What did it say about the self and the world?

Nyāya is a realism. Its thinkers argue that desire, cognition, pleasure and pain are qualities, that qualities need a substance, and that no material element will do, so that there is a self. Memory across time and recognition across the senses are given as further reasons for one persisting experiencer.

Against Buddhists who reduced wholes to heaps of momentary parts, it argued that composite things have capacities their parts lack (2.1.35). Nāgasena’s chariot is the classic Buddhist case, and Nyāya was one of its chief opponents. Aphorisms 4.2.26–36 reply to a scepticism of Nāgārjuna’s type by arguing that it defeats itself, and Nāgārjuna’s Vaidalyaprakaraṇa is organised around the sixteen categories in turn.

What was its influence?

Nyāya and its sister school Vaiśeṣika, of Kaṇāda, were later treated together. Commentators carried the tradition on: Uddyotakara, Vācaspati Miśra, Udayana, who defended the existence of God, and Jayanta. In about 1325 Gaṅgeśa began the “new” school, Navya-Nyāya. Nyāya’s methods of argument also shaped Indian literary criticism, debate and jurisprudence.

How should you start reading Akṣapāda Gautama?

Begin with the Internet Encyclopedia of Philosophy’s article on Nyāya, then read Book I, chapter 1 of the sūtras in Vidyabhusana’s translation, which has the categories and the four pramāṇas. The chapter on the Akṣapāda system in Mādhava’s Sarva-darśana-saṃgraha is a free medieval summary.