CHĀNDOGYA UPANISHAD · 8.12.5

अथ यो वेदेदं मन्वानीति स आत्मा ।
मनो ऽस्य दैवं चक्षुः ।
स वा एष एतेन दैवेन चक्षुषा मनसैतान् कामान् पश्यन् रमते य एते ब्रह्मलोके ॥

atha yo vededaṃ manvānīti sa ātmā ।
mano ’sya daivaṃ cakṣuḥ ।
sa vā eṣa etena daivena cakṣuṣā manasaitān kāmān paśyan ramate ya ete brahmaloke ॥

'He who knows, let me think this, he is the Self, the mind is his divine eye. He, the Self, seeing these pleasures (which to others are hidden like a buried treasure of gold) through his divine eye, i. e. the mind, rejoices.

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)