Maitrāyaṇīya Āraṇyaka 2.6

2.6

yānī̍mānye̱tānya̍sya raśmaya̱ḥ karmendri̱yāṇya̍sya ha̱yā ratha̍ḥ śa̱rīraṃ mano̍
ni̱yantā̍ prakṛtima̱yo̍'sya pra̱todo̱'nena kha̱lvīri̍taṃ paribhrama̱tīda̍m̐ śa̱rīraṃ
cakra̍miva mṛte̱ ca ne̍dam̐ śa̱rīraṃ ceta̍navatpratiṣṭhā̱pitaṃ pra̱coda̱yitā̍
vai̱ṣo'pya̱syeti̍

which are these are his rays; the sense organs of action are his horses; the body is the chariot; the mind is the charioteer; his whip consists of material nature. Impelled by him, indeed, this body wanders about like a wheel [turned] by a potter; and by him this body is established as intelligent, and he is also its impeller.'