Chāndogya Upaniṣad 7.3.1

7.3.1

mano vāva vāco bhūyaḥ \
yathā vai dve vāmalake dve vā kole dvau vā akṣau muṣṭir anubhavaty evaṃ vācaṃ ca nāma ca mano 'nubhavati \
sa yadā manasā manasyati mantrān adhīyīyety athādhīte \
karmāṇi kurvīyety atha kurute \
putrāṃś ca paśūṃś ceccheyety athecchate \
imaṃ ca lokam amuṃ ceccheyety athecchate \
mano hy ātmā \
mano hi lokaḥ \
mano hi brahma \
mana upāssveti \\703.1\

1. ‘Mind (*manas*), assuredly, is more than Speech. Verily, as the closed hand compasses two acorns, or two kola-berries, or two dice-nuts, so Mind compasses both Speech and Name. When through Mind one has in mind “I wish to learn the sacred sayings (*mantra*),” then he learns them; “I wish to perform sacred works (*karma*),” then he performs them; “I would desire sons and cattle,” then he desires them; “I would desire this world and the yonder,” then he desires them. Truly the self (*ātman*) is Mind. Truly, the world (*loka*) is Mind. Truly, Brahma is Mind.