The four pramāṇas are perception, inference, analogical reasoning, and testimony. We will discuss them in order. Then, we will consider Nyāya’s theory of knowledge in general.
a. Perception (pratyakṣa)
i. The Characteristics of Perception
Nyāya-sūtra 1.1.4 defines perceptual cognition as follows.
A perceptual cognition arises by means of the connection between sense faculty and object, is not dependent on words, is non-deviating, and is determinate.
This sūtra provides four conditions which must be met for cognition to be perceptual. The first, that cognition arises from the connection between sense faculty and object, evinces Nyāya’s direct realism. It is such connection, the central feature of the causal chain which terminates in perceptual cognition, which fixes the intentionality of a token percept. Uddyotakara enumerates six kinds of connection (sannikarṣa) to account for the fact that that we perceive not only substances, but properties, absences, and so on: (i) conjunction (samyoga), the connection between a sense faculty and an object; (ii) inherence in what is conjoined (saṁyukta-samavāya), the connection between a sense faculty and a property-trope which inheres in an object; (iii) inherence in what inheres in what is conjoined (saṁyukta-samaveta-samavāya), the connection between a sense faculty and the universal which is instantiated in a property-trope; (iv) inherence (samavāya), the kind of connection which makes auditory perception possible; (v) inherence in what inheres (samaveta-samavāya), the connection between the auditory faculty and universals which inhere within sounds; (vi) qualifier-qualified relation (viśeṣya-viśeṣaṇa-bhāva), the connection which allows for the perception of inherence and absence in objects. In all cases, the perceptual cognition is born of connection between a sense faculty and an occurrent fact or object.
The second condition, that the cognition produced is not dependent on words, has a somewhat complicated interpretive history. Generally, Nyāya holds that ordinary perception involves concept deployment. Therefore, this restriction does not endorse a view held by the Buddhist Dignāga and his followers, that genuine perception is non-conceptual (kalpanā-apodha). Still, the meaning of avyapadeśya is disputed amongst Naiyāyikas. On one reading, this qualification serves the purpose of distinguishing between perceptually and testimonially generated cognitions. The latter also require information provided by the senses but further require the deployment of semantic and syntactic knowledge. An allied reading suggests that while involving the application of concepts, perception of an object is often causally prior to speech acts involving it.
The third, “non-deviating” condition blocks false cognitions, like the misperception that an oyster shell is a piece of silver, from the ranks of pramāṇa-born. This is tied to the Nyāya notion that pramāṇas are by definition inerrant, and that false cognitive presentations are not truly pramāṇas but pseudo-pramāṇas (pramāṇa-ābhāsa). Though we may mistakenly take a pseudo-pramāṇa, like the illusion of a person in the distance, to be the real thing, it is not. “Perception” and similar pramāṇa-terms have success grammar for Nyāya.
The fourth, “determinate” condition blocks cognitions which are merely doubtful from the ranks of the pramāṇa-born. Dubious cognitions, like that of a distant person at dusk, do not convey misleadingly false information, but being unclear, they do not properly apprehend the object in question. It could be a person or a post. As such, one neither correctly grasps its character nor falsely takes it to represent accurately a certain object. Later Naiyāyikas, most notably Vācaspati Miśra, read the qualifiers “notdependent on words” and “determinate” disjunctively, in order to say that perception may be non-propositional or propositional. However anachronistic this may be as an interpretation of the Nyāya-sūtra, this division is accepted by later Nyāya.
2 Since Guru accepted that his is a foolish question hence there is no Logic or Nyaya; so teaching Vedas to sishya was not possible only because, Guru himself does not know; so logically someone shall first teach Guru after Guru learned Sanskrit. Also there is no deduction whether Sanskrit has anything to do with teaching by a guru as students must learn in which process everything is taught by Guru. And here the Guru is a fraud so student must seek elsewhere. ‘K Rajaram IRS 26226
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