The Taittirīya Upaniṣad (तैत्तिरीयोपनिषद्) belongs to the Krishna Yajurveda, forming the seventh, eighth, and ninth prapāṭhakas of the Taittirīya Āraṇyaka. In three sections — Śīkṣā-vallī, Brahmānanda-vallī, and Bhṛgu-vallī — it offers one of the most pedagogically complete teachings in the Upanishadic corpus, moving from the elementary discipline of correct pronunciation, through the famous doctrine of the five sheaths, to the climactic analysis of brahman as bliss.
The Three Vallis
A vallī (वल्ली) literally means a "creeper" — a winding plant — and the term suggests that each section develops by gradual extension rather than systematic argument. The three creepers of the Taittiriya are quite different in tone.
1. Shiksha-valli — The Discipline of Sound
The first vallī concerns phonetics and the foundations of Vedic study. It opens with the famous prayer:
ॐ शं नो मित्रः शं वरुणः ।
oṃ śaṃ no mitraḥ śaṃ varuṇaḥ "Om. May Mitra be auspicious to us. May Varuṇa be auspicious."
The vallī discusses the six elements of pronunciation (varna, svara, mātrā, bala, sāma, santāna) that the science of śikṣā will later codify. It includes the famous graduation address of the teacher to the departing student — satyaṃ vada, dharmaṃ cara ("speak the truth, walk in dharma") — a passage still recited at university convocations in modern India:
सत्यं वद । धर्मं चर । स्वाध्यायान्मा प्रमदः । आचार्यदेवो भव । मातृदेवो भव । पितृदेवो भव । अतिथिदेवो भव ।
satyaṃ vada, dharmaṃ cara, svādhyāyān mā pramadaḥ
ācāryadevo bhava, mātṛdevo bhava, pitṛdevo bhava, atithidevo bhava
"Speak the truth. Walk in dharma. Do not neglect your study. Let the teacher be a god to you, the mother a god, the father a god, the guest a god."
The atithidevo bhava ("let the guest be a god") of this passage has become, in modern times, the slogan of Indian hospitality and tourism.
2. Brahmananda-valli — The Five Sheaths and the Bliss of Brahman
The second vallī opens with a mahāvākya: सत्यं ज्ञानम् अनन्तं ब्रह्म — satyaṃ jñānam anantaṃ brahma — "Brahman is truth, knowledge, infinity."
It then introduces the famous teaching of the pañca-kośa (पञ्चकोश), the five sheaths covering the self like nested coverings around an inmost jewel:
- Annamaya-kośa — the sheath of food, the physical body.
- Prāṇamaya-kośa — the sheath of breath, the vital energy.
- Manomaya-kośa — the sheath of mind, of perception and impulse.
- Vijñānamaya-kośa — the sheath of understanding, of judgment and will.
- Ānandamaya-kośa — the sheath of bliss, the innermost — and within it, brahman itself.
The image is of progressive depth: as the meditator turns within, each sheath is recognized as a covering rather than the self, and finally even the bliss-sheath is recognized as the very substance of brahman. The teaching of the five sheaths became, in Shankara's hands and in the Vivekacūḍāmaṇi attributed to him, one of the standard introductory frameworks of Vedanta.
Brahman as Bliss
The second vallī contains the celebrated calculation of bliss. A measure of human bliss is taken as a baseline; the bliss of a king is a hundred times this; the bliss of the celestial gandharva a hundred times that; and so on through ten progressive multiplications, each by a hundred, ending in the infinite bliss of brahman. The teaching insists that the highest bliss is not other-worldly but simply unbroken bliss without contingency — what we would today call unconditioned beatitude.
3. Bhrigu-valli — The Inquiry of Bhrigu
The third vallī tells the story of Bhṛgu Vāruṇi, who asks his father Varuṇa to teach him brahman. Varuṇa replies enigmatically: That from which beings are born, by which the born live, into which they enter at death — desire to know that. That is brahman.
Bhrigu retires to perform tapas and returns with successive answers. He first concludes that brahman is food (matter); then breath; then mind; then understanding; then bliss. At each stage Varuna sends him back to deepen his inquiry. The narrative recapitulates the five-sheath teaching of the second vallī as a lived journey, ending with the recognition that bliss is the ultimate ground.
The Anukramani Verse
A small but famous formula closes the second vallī:
यतो वाचो निवर्तन्ते अप्राप्य मनसा सह ।
yato vāco nivartante aprāpya manasā saha "That from which words return, not having reached, together with the mind."
The verse will be quoted across the entire later Vedantic tradition as the classical statement of brahman's transcendence of language.
Reception
The Taittiriya is one of the most widely read Upanishads in classical Vedanta — partly because of its accessibility, partly because the five-sheath analysis offers a workable meditation framework. Shankara wrote a major commentary on it; Ramanuja drew from it some of his most important supports for the doctrine of brahman as the inner controller; and modern teachers — from Swami Sivananda to contemporary Vedanta classroom teachers — have used the pañca-kośa sequence as their introduction to the structure of the self.