Samkhya & Yoga Schools of Indian Philosophy

Samkhya and Yoga are two of the six orthodox (Astika) schools of Indian philosophy. Samkhya — derived from 'sankhya' meaning 'enumeration' — is one of the oldest systematic philosophies of India. It is a strictly dualistic school that enumerates the fundamental components of reality as two eternal, independent principles: Purusha (consciousness/spirit) and Prakriti (matter/nature). Yoga, as a philosophical school (distinct from its popular physical connotations), is the practical and spiritual counterpart of Samkhya — it shares the same metaphysical foundation but adds the concept of Ishvara (God) and provides a systematic eight-limbed path (Ashtanga Yoga) for achieving liberation. Together, these two schools form a theoretical-practical pair: Samkhya provides the map, and Yoga provides the path.

Samkhya — The Philosophy of Enumeration

Samkhya is often described as the first systematic philosophy of India. Its authorship is attributed to Kapila, though the earliest surviving text is the Samkhyakarika of Ishvarakrishna (approximately 4th–5th century CE). The two foundational principles are Purusha and Prakriti. Purusha is pure, unchanging, passive consciousness — the eternal 'witness.' There are, in classical Samkhya, multiple individual Purushas (one for each living being), each separate and unconnected. Purusha has no qualities, no activity, no desire. Prakriti is the primordial, unconscious material nature from which the entire phenomenal world evolves. It is composed of three inseparable gunas: Sattva (lightness, harmony), Rajas (activity, passion), and Tamas (heaviness, inertia). In the unmanifest state, the three gunas are in perfect equilibrium; evolution begins when this equilibrium is disturbed.

The 25 tattvas evolve in a specific sequence: from Prakriti emerges Mahat (cosmic intelligence or Buddhi). From Mahat emerges Ahamkara (ego/self-sense). From Ahamkara emerge: Manas (mind), the five Jnanendriyas (sense organs: ears, skin, eyes, tongue, nose), the five Karmendriyas (motor organs: speech, hands, feet, reproductive organ, excretory organ), the five Tanmatras (subtle elements: sound, touch, form, taste, smell), and the five Mahabhutas (gross elements: ether, air, fire, water, earth). Purusha remains ever-separate — it neither evolves nor is itself produced.

Bondage and Liberation in Samkhya

Suffering arises from the 'false identification' of Purusha with Prakriti. When Purusha 'sees' its reflection in the Buddhi (cosmic intelligence), it mistakenly identifies itself with the material process of evolution — with the body, mind, and ego. This false identification (avidya/avidhya) is the root of all suffering and the cycle of rebirth (samsara). Liberation (Kaivalya) is achieved through viveka — discriminative knowledge between Purusha (consciousness) and Prakriti (matter). When Buddhi attains viveka, it recognises that Purusha is forever separate from the material world. Prakriti ceases to evolve for that Purusha, which then exists in its original, isolated state of pure consciousness. This is a self-sufficient, atheistic path — no God is needed in classical Samkhya.

Yoga School — The Practical Path

Yoga, as a darshana, is systematised in the Yoga Sutras of Patanjali (approximately 2nd century BCE to 4th century CE). While accepting Samkhya's Purusha-Prakriti metaphysics, Patanjali makes two key modifications: he adds Ishvara (God) as a special, eternally liberated Purusha unaffected by karma; and he provides the Ashtanga (eight-limbed) Yoga as the practical methodology for achieving liberation.

The eight limbs are: (1) Yama — ethical restraints (non-violence, truthfulness, non-stealing, celibacy, non-possessiveness); (2) Niyama — personal observances (cleanliness, contentment, austerity, self-study, surrender to Ishvara); (3) Asana — stable, comfortable posture; (4) Pranayama — regulation of breath; (5) Pratyahara — withdrawal of the senses from external objects; (6) Dharana — concentrated attention on a single object; (7) Dhyana — sustained meditation; (8) Samadhi — complete absorption where the distinction between meditator, meditation, and its object dissolves.

Patanjali defines Yoga as 'chitta vritti nirodha' — the cessation of the fluctuations of the mind. When the mind is completely stilled, Purusha is revealed in its true nature. Ishvara in Yoga is not a creator God but a facilitator — devotion to Ishvara (Ishvara-pranidhana) is one of the powerful means to achieve the mental stillness that leads to liberation.

The Three Gunas in Practice

The three gunas have profound practical implications beyond metaphysics. A person dominated by Tamas will be lethargic, ignorant, and confused. A Rajasic person will be active, restless, and driven by desire. A Sattvic person will be calm, clear, and wise. Yoga practice is designed to reduce Rajas and Tamas and cultivate Sattva, thus preparing the Buddhi for viveka. Ultimately, even Sattva must be transcended — for pure consciousness (Purusha) is beyond all gunas. The Bhagavad Gita extensively uses the Samkhya framework of gunas to explain human behaviour, duty, and liberation.

Purusha: Pure, unchanging consciousness — the eternal witness; multiple in classical Samkhya. 

Prakriti: Primordial, unconscious matter — dynamic and constituted by the three gunas. 

Three Gunas: Sattva (clarity), Rajas (activity), Tamas (inertia) — the three forces of all matter. 

25 Tattvas: The complete enumeration of existence in Samkhya — from Prakriti to gross elements. 

Viveka: Discriminative knowledge separating Purusha from Prakriti — the tool of liberation. 

Kaivalya: Liberation — the isolation of Purusha in its own pure nature, free from Prakriti. 

Chitta Vritti Nirodha: Yoga's definition of its goal — cessation of mental fluctuations. 

Ishvara: God in Yoga — a special, eternally liberated Purusha; object of devotion. 

Ashtanga Yoga: The eight-limbed practical path to liberation codified by Patanjali. 

Avyakta: The unmanifest, undifferentiated state of Prakriti before evolution begins. 

Mahat/Buddhi: Cosmic intelligence — the first product of Prakriti's evolution.

Current Relevance

Yoga has become India's most significant global cultural export. The United Nations, on India's initiative (PM Modi's proposal at UNGA in 2014), declared June 21st as International Yoga Day in 2015. The Ministry of AYUSH (Ayurveda, Yoga, Naturopathy, Unani, Siddha, Homeopathy) was created to promote traditional health practices with Yoga at its centre. The Samkhya framework of gunas is used in contemporary Ayurvedic medicine to understand individual constitution (prakriti) and psychological balance. In GS-4, the concepts of chitta-shuddhi (purification of mind), ahimsa (non-violence), and satya (truthfulness) from Yoga's Yamas are directly applicable to public service ethics. UPSC has previously asked about Ashtanga Yoga in the context of India's philosophical schools.