Sanskrit (romanised) · Chāndogya Upaniṣad (Sanskrit, IAST)
yadā vai vijānāty atha satyaṃ vadati nāvijānan satyaṃ vadati vijānann eva satyaṃ vadati vijñānaṃ tv eva vijijñāsitavyam iti vijñānaṃ bhagavo vijijñāsa iti
English · F. Max Müller
'When one understands the True, then one declares the True. One who does not understand it, does not declare the True. Only he who understands it, declares the True. This understanding, however, we must desire to understand.' 'Sir, I desire to understand it.'