यतः वाचः निवर्तन्ते अप्राप्य मनसा सह आनन्दम् ब्रह्मणः विद्वान् न बिभेति कदाचन इति तस्य एषः एव शारीरः आत्मा यः पूर्वस्य तस्मात् वै एतस्मात् मनोमयात् अन्यः अन्तरः आत्मा विज्ञानमयः तेन एषः पूर्णः सः वै एषः पुरुषविधः एव तस्य पुरुषविधताम् अन्वयम् पुरुषविधः तस्य श्रद्धा एव शिरः ऋतम् दक्षिणः पक्षः सत्यम् उत्तरः पक्षः योगः आत्मा महः पुछ्छम् प्रतिष्ठा तत् अपि एषः श्लोकः भवति
yataḥ vācaḥ nivartante aprāpya manasā saha ānandam brahmaṇaḥ vidvān na bibheti kadācana iti tasya eṣaḥ eva śārīraḥ ātmā yaḥ pūrvasya tasmāt vai etasmāt manomayāt anyaḥ antaraḥ ātmā vijñānamayaḥ tena eṣaḥ pūrṇaḥ saḥ vai eṣaḥ puruṣavidhaḥ eva tasya puruṣavidhatām anvayam puruṣavidhaḥ tasya śraddhā eva śiraḥ ṛtam dakṣiṇaḥ pakṣaḥ satyam uttaraḥ pakṣaḥ yogaḥ ātmā mahaḥ puchcham pratiṣṭhā tat api eṣaḥ ślokaḥ bhavati
"Whence speech turns back together with the mind, not having reached — the bliss of Brahman he who knows fears nothing ever." He is the embodied self of the former. But within this [self] made of mind is another self, consisting of discernment: by that the former is filled. He too has the form of a man: after the man-shape of the one, man-shaped is the other. Faith is his head, the right his right side, the true his left side, yoga his trunk, the Great his lower part, the support. Of that there is also a verse.
561abe1d0900 · published Jul 26, 2026, 7:50:25 PM UTC
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On the threshold of the fourth sheath the Upaniṣad utters its most famous verse: yato vāco nivartante aprāpya manasā saha — "whence speech turns back, together with the mind, not having reached": speech and thought, man's two longest-range instruments, come to the boundary and turn back like waves from a cliff. But the line does not end in agnosticism: ānandaṁ brahmaṇo vidvān na bibheti kadācana — "he who knows the bliss of Brahman fears nothing ever": unattainable to the word, He is attained by knowledge-as-tasting; and the mark of the attainer is not erudition but fearlessness: fear is driven out to the end only by the Boundless.
Within the mind is the vijñānamaya, the self of discernment: discriminating knowledge, the will of decision (the buddhi of other texts). Its anatomy is the creed of Vedic epistemology: the head is śraddhā, faith! (discernment begins with trust in the truth — Naciketas is witness); the sides are ṛta and satya, heavenly and earthly truth; the trunk is yoga, yoking (truth is held by practice, not opinion); the support is mahaḥ, the Great (the very fourth vyāhṛti: intelligence stands on Brahman, whether it knows it or not).
So the third layer is removed: I am not the body, not the breath, not the mind; and even discernment, crowned with faith, is still a sheath. What lies deeper than intelligence? The Taittirīya answers with no abstraction — the next verse will name the layer of joy.