Aitareya Upaniṣad 3.1

3.1.1

ko 'yam.
ātmeti vayam upāsmahe.
kataraḥ sa ātmā.

1. [Question:] Who is this one? [Answer:] We worship him as the Self (Ātman). [Question:] Which one is the Self? [Answer:] [He] whereby one sees, or whereby one hears, or whereby one smells odors, or whereby one articulates speech, or whereby one discriminates the sweet and the unsweet; that which is heart (hṛdaya) and mind (manas)—that is, consciousness (saṃjñāna), perception (ājñāna), discrimination (vijñāna), intelligence (prajñāna), wisdom (medhas), insight (dṛṣṭi), steadfastness (dhṛti), thought (mati), thoughtfulness (manīṣā), impulse (jūti), memory (smṛti), conception (saṃkalpa), purpose (kratu), life (asu), desire (kāma), will (vaśa).

3.1.2

yena vā paśyati yena vā śṛṇoti yena vā gandhāñ jighrati yena vā vācaṃ vyākaroti yena vā svādu cāsvādu ca vijānāti.
yad etad dhṛdayaṃ manaś caitat.
sañjñānam ājñānaṃ vijñānaṃ prajñānaṃ medhā dṛṣṭir dhṛtir matir manīṣā jūtiḥ smṛtiḥ saṅkalpaḥ kratur asuḥ kāmo vaśa iti sarvāṇy evaitāni prajñānasya nāmadheyāni bhavanti.

All these, indeed, are appellations of intelligence (prajñāna).

3.1.3

eṣa brahmā.
eṣa indraḥ.
eṣa prajāpatiḥ.
ete sarve devāḥ.
imāni ca pañca mahābhūtāni pṛthivī vāyur ākāśa āpo jyotīṃṣīty etānīmāni kṣudramiśrāṇīva bījānītarāṇi cetarāṇi cāṇḍajāni ca jārujāni ca svedajāni codbhijjāni cāśvā gāvaḥ puruṣā hastino yat kiñcedam prāṇi jaṅgamaṃ ca patatri ca yac ca sthāvaram.
sarvaṃ tat prajñānetram.
prajñāne pratiṣṭhitam.
prajñānetro lokaḥ.
prajñā pratiṣṭhā.
prajñānaṃ brahma.

3. He is Brahma; he is Indra; he is Prajāpati; [he is] all these gods; and these five gross elements (mahā-bhūtāni), namely earth (pṛthivī), wind (vāyu), space (ākāśa), water (āpas), light (jyotīṁṣi); these things and those which are mingled of the fine (kṣudra), as it were; origins (bīja) of one sort and another: those born from an egg (aṇḍa-ja), and those born from a womb (jāru-ja), and those born from sweat (sveda-ja), and those born from a sprout (udbhij-ja); horses, cows, persons, elephants; whatever breathing thing there is here—whether moving or flying, and what is stationary.

All this is guided by intelligence, is based on intelligence. The world is guided by intelligence. The basis is intelligence. Brahma is intelligence.

3.1.4

sa etena prajñenātmanāsmāl lokād utkramyāmuṣmin svarge loke sarvān kāmān āptvāmṛtaḥ samabhavat samabhavat.

4. So he [i. e. Vāmadeva], having ascended aloft from this world with that intelligent Self (Ātman), obtained all desires in yon heavenly world, and became immortal—yea, became [immortal]!