CHĀNDOGYA UPANISHAD · 7.18.1

यदा वै मनुते ऽथ विजानाति ।
नामत्वा विजानाति ।
मत्वैव विजानाति ।
मतिस् त्व् एव विजिज्ञासितव्येति ।
मतिं भगवो विजिज्ञास इति ॥

yadā vai manute ’tha vijānāti ।
nāmatvā vijānāti ।
matvaiva vijānāti ।
matis tv eva vijijñāsitavyeti ।
matiṃ bhagavo vijijñāsa iti ॥

'When one perceives, then one understands. One who does not perceive, does not understand. Only he who perceives, understands. This perception, however, we must desire to understand.' 'Sir, I desire to understand it.'