2.3 Yoga in the Principal Upanishads

2.3 Yoga in the Principal Upanishads

The Vedic corpus moves from ritual to interiority, and the Upanishads are where that turn is completed. Where the Samhitas and Brahmanas describe the outer sacrifice (Yajna), the Upanishads describe the inner one (Antar-Yajna) — and in doing so they supply almost every technical term classical Yoga later formalises. Syllabus item 1.3 asks specifically for Yoga in the Principal Upanishads, so the first thing to fix is which Upanishads those are.

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Which Upanishads are "Principal"?

Of the 108 Upanishads listed in the Muktikopanishad, ten are traditionally called Mukhya or Principal because Adi Shankaracharya wrote commentaries on them. The standard memory verse runs:

Isha, Kena, Katha, Prashna, Munda, Mandukya, Taittirikam, Aitareyam cha Chandogyam, Brihadaranyakam tatha.

Two further Upanishads are constantly cited in yoga courses and must be placed correctly: Shvetashvatara (Krishna Yajurveda) and Maitrayaniya / Maitri (Krishna Yajurveda). Neither is one of Shankara's ten, but both are early and both are unusually technical about Yoga — which is precisely why they turn up in questions.

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What each contributes to Yoga

1. Kathopanishad — the definition and the vehicle

Yama's teaching to Nachiketa supplies two things classical Yoga never abandons. First, the Ratha Kalpana: body as chariot, intellect (Buddhi) as charioteer, mind (Manas) as reins, senses (Indriyas) as horses, sense-objects (Vishayas) as the roads. Second, the definition at Katha 2.3.11 — "Tam yogam iti manyante sthiram indriya-dharanam" — Yoga is the firm holding of the senses. Note the caution appended in the same verse: yogo hi prabhavapyayau, Yoga is subject to both arising and passing away, so vigilance (apramatta) is required. (Covered in full in Section 5.2.)

2. Taittiriya — the five sheaths and the measure of bliss

The Bhrigu Valli develops the Pancha Kosha model through the discipleship of Bhrigu under his father Varuna: the student meditates his way inward from Annamaya (food) to Pranamaya, Manomaya, Vijnanamaya and finally Anandamaya. The Ananda Mimamsa in the Brahmananda Valli is the passage that sets out a graded scale of bliss, beginning from one unit of human joy and multiplying it a hundredfold through successively higher orders of beings up to the bliss of Brahman — the point being that all worldly happiness is a fraction of a single indivisible Ananda. The Shiksha Valli adds the practical instructions to a departing student (Satyam vada, dharmam chara — speak the truth, walk in dharma).

3. Mandukya — the four quarters of consciousness

Twelve verses, and the whole of Vedantic psychology. Consciousness (Atman) has four padas:

For a yoga teacher this is not decoration. It is the map that lets you explain, without hand-waving, why Yoga Nidra is called psychic sleep and where it sits relative to ordinary sleep.

4. Prashna — Prana in five

The third question, put by Kaushalya, asks where Prana arises and how it enters the body. The answer distributes Prana into five functions — Prana in the eyes, ears, mouth and nose; Apana in the organs of excretion and generation; Samana in the middle, distributing food equally; Vyana through the 101 principal nadis; Udana leading upward at death. This fivefold division is the direct ancestor of the Pancha Prana material in Unit 3.

5. Shvetashvatara — the first practical manual

Verses 2.8–2.13 read like an instruction sheet:

• Hold the body erect with chest, neck and head in line (trir-unnatam sthapya samam shariram).
• Draw the senses and the mind into the heart.
• Restrain the breath; when it is subdued, breathe through the nostrils with diminished breath, and control the mind like a chariot yoked to unruly horses.
• Practise in a level, clean place, free from pebbles, fire and gravel, favourable to the mind by its sound and water, and not offensive to the eye — a sheltered spot protected from the wind.
• Signs of early progress (2.13): laghutvam (lightness), arogyam (health), alolupatvam (absence of greed), clear complexion, pleasant voice, agreeable odour, and scanty excretions.

That list of signs is quotable in the viva as evidence that the tradition itself specified observable, physical criteria of progress.

6. Chandogya — food and mind

"Ahara-shuddhau sattva-shuddhih; sattva-shuddhau dhruva smritih" (Chandogya 7.26.2): when the food is pure, the inner being becomes pure; when the inner being is pure, memory becomes firm. This is the scriptural warrant for the entire Mitahara and Pathya/Apathya material in Unit 2 — the yogic diet is not a health fad but an epistemological claim about the conditions of a steady mind.

7. Maitrayaniya — the six-limbed Yoga

Maitrayaniya 6.18 enumerates Shadanga Yoga: Pranayama, Pratyahara, Dhyana, Dharana, Tarka, Samadhi. Compare with Patanjali's eight limbs and two differences leap out: Yama, Niyama and Asana are absent, and Tarka (reasoning / discriminative reflection) is present. This is the classic Upanishad-versus-Patanjali discriminator question.

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Summary of Exam-Key Points

• Ten Mukhya Upanishads: Isha, Kena, Katha, Prashna, Mundaka, Mandukya, Taittiriya, Aitareya, Chandogya, Brihadaranyaka.
• Shvetashvatara and Maitrayaniya are not among the ten but are the most technically yogic.
• Mandukya: four quarters — Vaishvanara (A), Taijasa (U), Prajna (M), Turiya (silence).
• Maitrayaniya 6.18: Shadanga Yoga — Pranayama, Pratyahara, Dhyana, Dharana, Tarka, Samadhi.
• Chandogya 7.26.2: Ahara-shuddhau sattva-shuddhih.
• Shvetashvatara 2.13: lightness, health, freedom from greed, clear complexion, sweet voice, agreeable odour, scanty excretion.