Prajnanam Brahma (प्रज्ञानम् ब्रह्म) - "Consciousness is Brahman" (Aitareya Upanishad 3.3 of the Rig Veda)
This One is (the inferior) Brahman; this is Indra, this is Prajapati; this is all these gods; and this is these five elements, viz earth, air, space, water, fire; and this is all these (big creatures), together with the small ones, that are the procreators of others and referable in pairs to wit, those that are born of eggs, of wombs, of moisture, of the earth, viz horses, cattle, men, elephants, and all the creatures that there are which move or fly and those which do not move. All these have Consciousness as the giver of their reality; all these are impelled by Consciousness; the universe has Consciousness as its eye, and Consciousness is its end. Consciousness is Brahman.
(tr-Gambhirananda)
eṣa brahmaiṣa indra eṣa prajāpatir-ete sarve devā
imāni ca pañca mahābhūtāni pṛthivī vāyur-ākāśa āpo
jyotīṁśītyetānīmāni ca kṣudra-miśrāṇīva
bījānītarāṇi cetarāṇi cāṇdajāni ca
jārūjāni ca svedajāni codbhijāni ca-
asvā gāvaḥ puruṣā hastino yatkiñcedaṁ
prāṇi jaṅgamaṁ ca patatri ca
yacca sthāvaraṁ sarvaṁ tat-prajñānetram,
prajñāne pratiṣṭhitaṁ prajnānetro
lokaḥ prajñā pratiṣṭhā prajñānaṁ brahma.