Taittirīya Upaniṣad 2.4.1

2.4.1

yato vāco nivartante /
aprāpya manasā saha /
ānandaṃ brahmaṇo vidvān /
na bibheti kadācaneti /
tasyaiṣa eva śārīra ātmā /
yaḥ pūrvasya /
tasmādvā etasmānmanomayāt /
anyontara ātmā vijñānamayaḥ /
tenaiṣa pūrṇaḥ /
sa vā eṣa puruṣavidha eva /
tasya puruṣavidhatām /
anvayaṃ puruṣavidhaḥ /
tasya śraddhaiva śiraḥ /
ṛtaṃ dakṣiṇaḥ pakṣaḥ /
satyamuttaraḥ pakṣaḥ /
yoga ātmā /
mahaḥ pucchaṃ pratiṣṭhā /
tadapyeṣa śloko bhavati // 1//
iti caturtho 'nuvākaḥ //

Wherefrom words turn back,
Together with the mind, not having attained—
The bliss of Brahma he who knows,
Fears not at any time at all.

This, indeed, is its bodily self (*śarīra-ātman*), as of the former.

Verily, other than and within that one that consists of mind is a self that consists of understanding (*vijñāna-maya*). By that this is filled. This, verily, has the form of a person. According to that one's personal form is this one with the form of a person. Faith (*śraddhā*) is its head; the right (*ṛta*), the right side; the true (*satya*), the left side; contemplation (*yoga*), the body (*ātman*); might (*mahas*), the lower part, the foundation.

As to that there is also this verse:—