Often translated simply as "logic," the Sanskrit word _nyāya_ means "rule of reasoning" or "method of reasoning." Texts from the school of classical Indian philosophy that bears this name are concerned with cognition, reasoning, and the norms that govern rational debate. This translation of selections from the early school of Nyāya focuses on its foundational text, the _Nyāya-sūtra_, with excerpts from the early commentaries. It will be welcomed by specialists and non-specialists alike seeking an accessible text that both represents (...) some of the best of Indian philosophical thought and can be integrated into courses on Indian philosophy, religion, and intellectual culture. (shrink)

In his celebrated treatise of Navya-nyāya, the Tattvacintāmaṇi, Gaṅgeśa offers a detailed formulation of the inference of God’s existence. Gaṅgeśa’s inference generated significant commentarial literature among Naiyāyikas in Mithilā, Navadvīpa and Vārāṇasī, but also attracted the attention of South Indian scholars, notably Vyāsatīrtha, who comments on it extensively in the Tarkatāṇḍava. In the wake of Vyāsatīrtha’s pioneering critique, the 16th-century Sanskrit polymath Appaya Dīkṣita developed a revised version of Gaṅgeśa’s inference in his magnum opus of Śivādvaita Vedānta, the Śivārkamaṇidīpikā. (...) This article highlights that Appaya was thoroughly acquainted with the technical idiom of Navya-nyāya and sufficiently conversant with its literature to address authoritatively one of its key problems. Appaya’s contribution sheds new light on how the Navya-nyāya tradition continued to flourish in South India during the late medieval period. (shrink)

The Nyāya school of classical Indian epistemology defended (by today’s standards) a radical version of epistemic externalism. They also gave arguments from their epistemological positions to an early version of disjunctivism about perceptual experience. In this paper I assess the value of such an argument, concluding that a modified version of the Nyāya argument may be defensible.

This is an overview of the Nyaya ("Logic") school of classical Indian philosophy, focusing on the earlier period (up to roughly 1000 CE).

The Nyãya philosophy is primarily concerned with the conditions of valid thought and the means of acquiring true knowledge of objects. Its ultimate end, like that of the other systems of Indian philosophy, is liberation-a state of pure existence- which is free from both pleasure and pain. For the attainment of this liberation, a true knowledge of objects is the surest means. Hence the theory of knowledge is the very foundation of the Nyãya system. The Nyãya Theory of Knowledge is (...) the first systematic, critical and comparative treatment of the Nyãya epistemology. It reveals how, as a thorough-going realistic view of the universe, the Nyãya philosophy supplies an important Eastern parallel to the triumphant modern Realism of the West, and contains anticipations of as well as possible alternatives to many contemporary realistic theories. This book is important as much for the correct understanding of ancient Indian philosophy, as for the evaluation of modern Western philosophy. (shrink)

The classical Indian school called Nyāya (literally “logic” or “right reasoning”), is arguably the leading anti-skeptical tradition within all of Indian philosophy. Defending a realist metaphysics and an epistemology of “knowledge sources” (pramāṇa), its responses to skepticism are often appropriated by other schools of thought. This paper examines its responses to skeptical arguments from dreams, from “the three times,” from justificatory regress, and over the problem of induction.

Much of classical Hindu thought has centered on the question of self: what is it, how does it relate to various features of the world, and how may we benefit by realizing its depths? Attempting to gain a conceptual foothold on selfhood, Hindu thinkers commonly suggest that its distinctive feature is consciousness (caitanya). Well-worn metaphors compare the self to light as its awareness illumines the world of knowable objects. Consciousness becomes a touchstone to recognize the presence of a self. A (...) rock is insentient, void of consciousness, and purely an object. Selves, however, are loci of awareness and thus subjects. Some schools, most notably classical Sāṁkhya and Advaita Vedānta, take this approach to its furthest conclusion: consciousness is not only unique to the self, but is the fundamental feature of selfhood. Other putative features of the self—feelings, memories, moral responsibility, and importantly, agency (kartṛtva)—are taken to be the impositions of insentient matter (prakṛti) or symptoms of primordial illusion (avidyā). Against this position, Nyāya defends a more robust notion of selfhood, placing qualities like desire, aversion, volition, and moral responsibility alongside cognition as the self’s distinctive qualities. These various aspects of selfhood come together neatly when we consider agency. An agent performs intentional actions under her volition, which is triggered by her own cognitive and affective states. Her volitional acts further generate moral consequences which she must bear, and which are, in the Indian context, embodied in the form of karmic merit and demerit. For Nyāya, agency is, therefore, a special expression of the self’s different capacities and potentialities, which coherently binds them together. Nyāya’s view is an important contribution to Indian theories of self as it is a counterpoint to what we may call exclusively cognitive accounts of selfhood in other influential Hindu schools, as noted above. The first half of this paper will consider Nyāya’s conception of agency in relation to selfhood. The second half will discuss Nyāya’s arguments with other Hindu schools—specifically Sāṁkhya—in support of the thesis that the self must be an agent as well as a knower. (shrink)

A Nyaya definition the major purpose of which is efficient use of words and avoiding ambiguities and errors, is the statement of a unique feature that belongs to each definiendum and nothing else so that there is none of the three faults of overcoverage, undercoverage and failure to belong to any definiendum. There should be no circularity that is of three kinds, self-dependence (where the definiendum appears in the definiens); mutual dependence (where the definiendum and the definiens are used in (...) the definition of each other) and defining in a circle. A definition should also be economical: there are mainly three kinds of economy; economy in constitution (that avoids including anything superfluous or unnecessary to distinguish the definiendum from everything else), economy in relation (the directly related is preferable to the indirectly related) and economy in cognition (something cognitively prior is preferable to something posterior). While more than one definition is possible that need not state the essence, the test of economy is in place to avoid redundancy and provide criteria of preference among defining features that are unique and non-circular. (shrink)

In contemporary Cognitive Science and Philosophy of Mind, "attention" is a burgeoning field, with ever-increasing amounts of empirical research and philosophical analysis being directed toward it.1 In this essay I make a first attempt to contrast how Nyāya-Vaiśeṣikas2 and Buddhists would address some aspects of attention that are discussed in that literature. The sources of what I attribute to "Nyāya-Vaiśeṣikas" are the sections dealing with the manas in the Nyāyabhāṣya, Nyāyamañjarī, and Praśastapādabhāṣya. The words "Buddhist" and "Buddhism" in (...) this essay refer specifically to the Sautrāntika Buddhism of Vasubandhu's Abhidharmako-śabhāṣya.3 A comparison... (shrink)

While many people today might turn to ancient Sanskrit philosophers for meditation or yoga, probably few would turn to them for help with difficult contemporary problems, such as what counts as "fake news" or navigating Internet debates. Philosopher Malcolm Keating argues that, in fact, a group of premodern Indian philosophers known as "Nyāya" have important things to say about how we can distinguish truth from falsity and reason well together, both of which are crucial to living a good life. (...) -/- In Reason in an Uncertain World, Keating teaches us what's distinctive in Nyāya approaches to knowledge and discussion, explaining these ideas in relationship to ordinary examples readers can understand. What are the limits of our reasoning? What counts as good evidence for our beliefs? How do we know if someone is a trustworthy source of information? What do we do when we are gripped by doubt? When is a debate with someone worth our time, and how can we discuss contentious topics? The answers to these questions are as relevant today as they were in ancient India. There, they were the focus of Nyāya philosophy, one of the most influential traditions of Indian philosophy, which few outside of scholarly communities have heard of. (shrink)

This paper focuses on the relevance of Indian epistemology and the philosophy of language to contemporary Western philosophy. Hence it discusses (1) how perceptual, inferential and verbal cognitions are related to the same object, (2) how to draw the distinction in meaning between transformationally equivalent sentences, such as ‘Brutus killed Caesar’ and ‘Caesar was killed by Brutus’, and (3) why the predicate-expression is to be considered as unsaturated but the subjectexpression as saturated. In order to answer these questions the (...) class='Hi'>Nyāya philosophers have discussed the distinction between several pairs of terms, such as ‘subject–predicate’, ‘qualificand–qualifier’ and ‘the first term–the second term’. This paper also deals with the Nyāya conception of inference for others, and the interpretations of the premise called ‘upanaya’ (‘application’) or the cognition called ‘parāmarśa’ (‘operation’). (shrink)

One of the aims of this paper is to discuss the different senses of the term 'existence' as used by the nyaya philosophers. this discussion leads us to a discussion on absence or negation and its role in logic. a discussion on empty terms has also been introduced in this context. according to the nyaya, existence, knowability and nameability are considered as universal properties. the distinction between these universal properties has been discussed in this context. i have also discussed the (...) question whether the nyaya has used redundant terms in designating the same imposed property by using three different terms. a distinction between different senses of the term 'property' has also been discussed in this context. (shrink)

This paper elaborates upon various responses to the Problem of the One over the Many, in the service of two central goals. The first is to situate Huayan's mereology within the context of Buddhism's historical development, showing its continuity with a broader tradition of philosophizing about part-whole relations. The second goal is to highlight the way in which Huayan's mereology combines the virtues of the Nyāya-Vaisheshika and Indian Buddhist solutions to the Problem of the One over the Many while (...) avoiding their vices. (shrink)

The purpose of this paper is to demonstrate how the navya-Nyaya school of indian philosophy determines the truth or falsity of a sentence which contains an empty term, And to point out some similarities and differences between its method of analysis and truth-Value determinations of such sentences and that of bertrand russell.

An ongoing effort, exemplified though happily not exhausted in the work of B. K. Matilal, is to present the best of classical Indian philosophy in a way that speaks to contemporary philosophical concerns, while still being historically and philologically responsible. Epistemology in Classical India: The Knowledge Sources of the Nyāya School by Stephen Phillips is expressly this kind of work. Phillips begins by explaining that his book is “for philosophers and students of philosophy, not for specialists in classical Indian (...) thought” (p. 1). His project is to engage with a range of classical texts and contemporary philosophy, in order to offer the Nyāya theory of knowledge as a coherent system. A welcome feature of .. (shrink)

The Bhagavad-Gita, as a multivalent text, has been a source of inspiration for all areas of Indian thought. This paper identifies elements in the Bhagavad-Gita which may have influenced the formation of Nyaya philosophy in the centuries after it was written. Part one of the paper reviews Nyaya epistemology as a whole, focusing on aspects that play an important role in the Bhagavad-Gita: perception (pratyaksa), inference (anumana), ‘syllogism’, verbal utterance (sabda) and the practical orientation of knowledge. The second part shows (...) how those aspects appear in the text of the Bhagavad-Gita. In praticular, Krishna relies on a number of techniques in convincing Arjuna of his obligation as a ksatria which would later be formalized in Nyaya philosophy as pramana or methods of knowing. As a whole, the Bhagavad-Gita also emphasizes the Nyaya view that knowledge is only useful insofar as it helps the knower achieve a particular goal. This paper does not, and has no pretention to prove the existence of a direct line of influence connection the Bhagavad-Gita and Nyaya philosophy; readers will instead gain an appreciation of the shared cultural context which gave rise to both of these forms of Indian thought. Abstrak Bhagavad-Gita, sebagai teks yang multitafsir, telah menjadi sumber inspirasi bagi segala pemikiran India. Makalah ini mengidentifikasikan unsur-unsur dalam Bhagavad-Gita yang mungkin memengaruhi pembentukan filsafat Nyaya selama beberapa abad setelah Bhagavad-Gita ditulis. Bagian pertama makalah meringkas epistemologi Nyaya secara keseluruhan dengan berfokus pada aspek-aspek yang memainkan peran penting dalam Bhagavad-Gita: persepsi (pratyaksa), penyimpulan (anumana), ‘silogisme’, saksi verbal (sabda), dan orientasi praktis pengetahuan. Bagian kedua memperlihatkan bagaimana aspek-aspek tersebut muncul dalam teks Bhagavad-Gita. Secara khusus, Krishna mengandalkan berbagai teknik dalam meyakinkan Arjuna akan kewajibannya sebagai ksatria yang kemudian diformalkan dalam filsafat Nyaya sebagai pramana atau sarana pengetahuan. Secara keseluruhan, Bhagavad-Gita juga menekankan pandangan Nyaya bahwa pengetahuan hanya berguna sejauh dapat membantu si penahu mencapai tujuan tertentu. Makalah ini tidak dapat membuktikan adanya garis pengaruh langsung yang menghubungkan Bhagavad-Gita dengan filsafat Nyaya; namun, kita tetap dapat mengapresiasi suatu ‘kemiripan keluarga’ di antara keduanya yang menunjukkan kekayaan konteks kebudayaan yang menghasilkan kedua buah pemikiran peradaban India ini. (shrink)

I would like to introduce the problematic to be addressed in this short article simply as follows. According to the majority of the modern interpreters of the Nyāya philosophy, the Naiyāyika-s are ontologically committed to an uncompromising direct realist theory of perception and to externalism both in epistemology and philosophy of mind. Computationalists, on the other hand, in their ontology, are frank or secret supporters of the view that what we cognize, even what we perceive, is representational. These two (...) claims appear to be opposed to each other. Naturally, the question arises: Is a computational account of intentional mental state, as proposed by Matilal, in his magnum opus Perception, admissible in the Navya-Nyāya framework? Though Matilal has not restricted the conundrum to Navya-Nyāya, the way he has analyzed the cognitive states are available only in the Navya-Nyāya literature. The main objective of this article is to strengthen Matilal’s position further with the help of some additional arguments from the Navya-Nyāya treatises. (shrink)

Scholarly disquisitions on Nyāya(-Vaiśeṣika) philosophy in the English language generally agree in calling it “metaphysical realism” or simply “realism.” Metaphysical realism or realism as understood in the West is the doctrine that (1) substances (particulars)/things and events exist independently of the knowing/thinking mind, and that (2) they exemplify properties/qualities and enter into relations—in short, universals—independently of the concepts by which we know them and, Nyāya would add, even of the language with which we describe them. This mind-independent world (...) is supposed to be something correspondence with which renders our particular beliefs/cognitions determinately true or false. Thus, realism, in all .. (shrink)

In this paper I revisit the early Nyāya argument for the existence of a self. In section 1, I reconstruct the argument in Nyāya-sūtra 1.1.10 as an argument from recognition following the interpretation in the Nyāyasūtra-Bhāṣya and the Nyāya-Vārttika. In Section 2, I reassess the plausibility of the Nyāya argument from memory/recognition in the Bhāṣya and the Vārttika in the light of recent empirical research. I conclude that the early Nyāya version of the argument from (...) recognition can only establish a minimal conclusion that self is a unitary and persisting conscious agent, in contrast to the ontological conclusion that the self is distinct a substance qualified by consciousness. In the final section, I address the tension between the two conclusions in Nyāya and suggest how it might be resolved. (shrink)

This work is a translation of selected sutras of the Nyāya-sūtra, together with relevant extracts from three commentaries: Nyāya-sūtra-bhāṣya of Vātsyāyana; Nyāya-vārttika of Uddyotakara; and Nyāya-vārttika-tātparya-ṭīkā of Vācaspatimiśra. The translators' introduction gives a general overview of the Nyāya school, its overall aims, and its place within classical Indian philosophy. Each of the nine chapters covers a particular topic in the Nyāya scheme: knowledge sources, philosophical method, the Nyāya defense of metaphysical realism, the self, (...) substance and causation, God, theory of meaning, value theory, and debate. For a given topic there will be sūtras... (shrink)

Misperception is part of the human condition. Consider a classic case of coming to confirm that one has had a misperception. On a stroll through the woods you see, in the distance, what seems to be a person. As you draw near, what looked like a person now appears to be a wooden post with a hat on it. On arrival you touch the post to confirm that it is not a person. From a pre-theoretical perspective, what has happened? On (...) your approach you judged that there was a person, based on what you saw. When near, you judged that it was a post and not a person, and then by touch you confirmed that what you initially saw was a misperception.In examining cases of misperception it is important to ask: what role does concept .. (shrink)

In this article, I explore the encounter of the Mādhva philosopher Vyāsatīrtha with the works of the Navya-Naiyāyika Gaṅgeśa Upādhyāya. The article is based on original translations of passages from Vyāsatīrtha’s Nyāyāmr̥ta and Tarkatāṇḍava. Philosophically, the article focuses on the issue of empty-terms/nonexistent entities, particularly in the context of the theory of inference. I begin by outlining the origin of the Mādhva and Nyāya positions about these issues in their respective analyses of perceptual illusion. I then contrast the role (...) of Gaṅgeśa’s thought in the Nyāyāmr̥ta and Tarkatāṇḍava and show how Vyāsatīrtha responds to Gaṅgeśa’s ideas in different ways in those texts. I conclude with a discussion of how Vyāsatīrtha defends the Mādhva theory of “substrate-free” qualities against Gaṅgeśa in order to show that we can think and make valid inferences about nonexistent things. (shrink)