A complete guide to the six orthodox Hindu philosophy schools (Ṣaḍ Darśana) — Nyāya, Vaiśeṣika, Sāṃkhya, Yoga, Mīmāṃsā, and Vedānta — with founders, key texts, core doctrines, and their relevance to UPSC Civil Services Examination.
Hindu philosophy schools refer to the six orthodox (Āstika) systems of Indian philosophy — Nyāya, Vaiśeṣika, Sāṃkhya, Yoga, Mīmāṃsā, and Vedānta — that accept the authority of the Vedas. Together called Ṣaḍ Darśana (six visions), they provide systematic frameworks for understanding reality, knowledge, liberation, and the relationship between the self and the cosmos.
What Are the Āstika and Nāstika Schools of Indian Philosophy?
Indian philosophy is broadly divided into two categories based on their attitude towards the Vedas:
- Āstika (Orthodox) Schools: These six systems accept the supreme authority of the Vedas as a valid source of knowledge. They are Nyāya, Vaiśeṣika, Sāṃkhya, Yoga, Mīmāṃsā, and Vedānta, traditionally paired into three allied couples: Nyāya–Vaiśeṣika, Sāṃkhya–Yoga, and Mīmāṃsā–Vedānta.
- Nāstika (Heterodox) Schools: Systems that reject the authority of the Vedas. The major heterodox schools are Buddhism, Jainism, and Cārvāka (materialist school). The term "nāstika" does not mean atheist but literally "one who says it is not" — signifying rejection of Vedic testimony as binding.
This foundational classification is a recurring question in UPSC Prelims and GS Paper 1 (Art and Culture) and must be clearly understood by every aspirant.
What Are the Six Orthodox Hindu Philosophy Schools (Ṣaḍ Darśana)?
The six Hindu philosophy schools reached systematic written form broadly between 200 BCE and 500 CE, though their oral traditions are far older. Each school addresses the fundamental questions of metaphysics (the nature of reality), epistemology (valid sources of knowledge), and soteriology (the path to liberation or mokṣa). The table below compares each school at a glance:
| School | Founder / Systematiser | Key Text (Sūtra) | Core Doctrine |
|---|---|---|---|
| Nyāya | Gautama (Akṣapāda) | Nyāya Sūtras | Logic and valid knowledge (pramāṇa); liberation through correct reasoning |
| Vaiśeṣika | Kaṇāda (Ulūka) | Vaiśeṣika Sūtras | Atomism; reality consists of eternal, indivisible atoms (paramāṇu) and their combinations |
| Sāṃkhya | Kapila | Sāṃkhya Kārikā (Īśvarakṛṣṇa) | Dualism of Puruṣa (consciousness) and Prakṛti (matter); 25 cosmic principles (tattvas) |
| Yoga | Patañjali | Yoga Sūtras | Practical eight-limbed discipline (Aṣṭāṅga Yoga) for stilling the mind and attaining liberation |
| Mīmāṃsā | Jaimini | Mīmāṃsā Sūtras | Vedic ritual duty (dharma); the eternal, self-valid Vedas are the supreme authority |
| Vedānta | Bādarāyaṇa (Vyāsa) | Brahma Sūtras | Nature of Brahman (ultimate reality) and its relationship to individual self (Ātman) |
1. Nyāya School — The Path of Logic
Founded by the sage Gautama (also called Akṣapāda), Nyāya is the school of logical analysis and epistemology. It identifies four valid means of knowledge (pramāṇas): perception (pratyakṣa), inference (anumāna), comparison (upamāna), and verbal testimony (śabda). The school holds that ignorance of the true self causes suffering, and liberation (apavarga) is attained through correct knowledge secured by rigorous logical inquiry. Nyāya's five-membered syllogism (avayava) greatly influenced Indian philosophical debate across all schools.
2. Vaiśeṣika School — The School of Particulars
Kaṇāda (literally "atom-eater") founded this school, which stands as one of the world's earliest systematic atomic theories. Reality is composed of nine substances: earth, water, fire, air, ether (ākāśa), time, space, self (ātman), and mind (manas). The visible universe results from combinations of eternal, indivisible atoms. Vaiśeṣika is closely allied with Nyāya and shares the view that liberation comes through knowledge of ultimate reality.
3. Sāṃkhya School — Classical Dualism
Attributed to the sage Kapila, Sāṃkhya is among the oldest Indian philosophical schools and offers a systematic metaphysics based on strict dualism. It posits 25 tattvas (cosmic principles) evolving from two ultimate realities: Puruṣa (pure, passive consciousness) and Prakṛti (primal, active matter). All suffering arises from the false identification of Puruṣa with Prakṛti's three qualities (guṇas) — sattva (clarity), rajas (activity), and tamas (inertia). Liberation is achieved when Puruṣa recognises its complete distinctness from Prakṛti. Sāṃkhya provides the metaphysical foundation that the Yoga school accepts and builds upon.
4. Yoga School — Practical Discipline
Patañjali systematised Yoga philosophy in the Yoga Sūtras (circa 400 CE). Sharing Sāṃkhya's metaphysics, Yoga focuses on the practical path of mental discipline. Its defining contribution is the eight-limbed path (Aṣṭāṅga Yoga): Yama (ethical restraints), Niyama (personal disciplines), Āsana (postures), Prāṇāyāma (breath control), Pratyāhāra (sense withdrawal), Dhāraṇā (concentration), Dhyāna (meditation), and Samādhi (absorption). The goal is expressed in the opening aphorism: yogaś citta-vṛtti-nirodhaḥ — Yoga is the stilling of the fluctuations of the mind.
5. Mīmāṃsā School — Vedic Ritualism
Jaimini's Mīmāṃsā Sūtras deal primarily with the correct interpretation of Vedic injunctions governing ritual duty. Also called Pūrva Mīmāṃsā (earlier inquiry), the school holds that the Vedas are eternal, uncreated, and self-authoritative (apauruṣeya). Liberation is achieved through faithful performance of prescribed rituals and dharmic duties. Mīmāṃsā developed highly sophisticated theories of linguistic meaning (śabda), which deeply influenced Sanskrit grammar and hermeneutics.
6. Vedānta School — Knowledge of the Absolute
Vedānta (Uttara Mīmāṃsā, or "later inquiry") is grounded in three foundational texts — the Upaniṣads, the Bhagavad Gītā, and Bādarāyaṇa's Brahma Sūtras — collectively known as the Prasthānatrayī. It explores the nature of Brahman (ultimate reality) and its relationship to Ātman (individual self). Three major sub-schools emerged: Advaita (non-dualism) of Śaṅkarācārya, which identifies Ātman with Brahman; Viśiṣṭādvaita (qualified non-dualism) of Rāmānuja; and Dvaita (dualism) of Madhva. Vedānta remains the most widely studied and debated of all Hindu philosophical traditions.
Why Are Hindu Philosophy Schools Important for UPSC?
The six Hindu philosophy schools appear across multiple stages of the Civil Services Examination:
- Prelims: Questions on founders, paired schools, and key concepts — such as Puruṣa–Prakṛti, the eight limbs of Yoga, and Kaṇāda's atomism — feature regularly in the General Studies paper.
- GS Paper 1 (Mains): Short answers and essays on Indian philosophical traditions, the Āstika–Nāstika classification, and contributions of thinkers such as Śaṅkarācārya, Rāmānuja, and Patañjali are expected.
- History Optional: Detailed treatment of the Ṣaḍ Darśana, their social context in ancient India, and their relationship to Buddhist and Jain heterodox challenges is a standard component of Paper 1 (Ancient India).
Frequently Asked Questions
What are the six schools of Hindu philosophy?
The six schools of Hindu philosophy, collectively called Ṣaḍ Darśana, are Nyāya (logic), Vaiśeṣika (atomism), Sāṃkhya (dualism), Yoga (practical discipline), Mīmāṃsā (Vedic ritualism), and Vedānta (knowledge of Brahman). All six accept the authority of the Vedas and are therefore classified as orthodox (Āstika) schools.
Who are the founders of the six Hindu philosophy schools?
The traditional founders are: Gautama (Nyāya), Kaṇāda (Vaiśeṣika), Kapila (Sāṃkhya), Patañjali (Yoga), Jaimini (Mīmāṃsā), and Bādarāyaṇa or Vyāsa (Vedānta). Each school traces its systematic exposition to a founding sūtra text attributed to these sages.
What is the difference between Āstika and Nāstika schools?
Āstika schools accept the authority of the Vedas as the supreme source of valid knowledge. Nāstika schools — primarily Buddhism, Jainism, and Cārvāka — reject Vedic authority. The distinction is not necessarily between theism and atheism; for example, Sāṃkhya is Āstika but does not posit a creator God.
How are the six schools paired in Indian philosophical tradition?
The six schools are traditionally grouped into three allied pairs: Nyāya and Vaiśeṣika (share epistemological and metaphysical frameworks), Sāṃkhya and Yoga (share metaphysical framework; Yoga adds practical discipline), and Mīmāṃsā and Vedānta (both grounded in Vedic texts; Mīmāṃsā focuses on the earlier ritual portions, Vedānta on the Upaniṣads).
What is the significance of Patañjali's Yoga Sūtras for the UPSC examination?
Patañjali's Yoga Sūtras are significant for UPSC as they systematise the eight-limbed (Aṣṭāṅga) Yoga path, provide the philosophical basis for Yoga as a school of thought distinct from mere physical exercise, and contextualise India's classical contribution to mind-body discipline. Questions on the Yoga Sūtras and the eight limbs appear in both Prelims and GS Paper 1.
Sources and Further Reading
According to IGNOU's BHIC-132 (History of India: Earliest Times to 300 CE), Unit 8 — "Philosophical and Religious Developments" — the Ṣaḍ Darśana emerged as systematic schools between approximately the 2nd century BCE and the 5th century CE, consolidating centuries of earlier oral philosophical traditions. The unit situates the rise of these schools within the broader context of post-Vedic intellectual ferment, the challenge posed by heterodox movements such as Buddhism and Jainism, and the synthesis achieved through Upaniṣadic thought. Learners are further encouraged to consult NCERT Class 11 Themes in Indian History and A.L. Basham's The Wonder That Was India for supplementary perspectives on the development of Indian philosophy in its cultural and social context.