KENA UPANISHAD · 1/3

न तत्र चक्षुर्गच्छति न वाग् गच्छति नो मनः ।
न विद्मो न विजानीमो यथैतदनुशिष्यात् ।
अन्यदेव तद्विदितादथो अविदितादधि ।
इति शुश्रुम पूर्वेषां ये नस्तद् व्याचचक्षिरे ॥

na tatra cakṣurgacchati na vāg gacchati no manaḥ ।
na vidmo na vijānīmo yathaitadanuśiṣyāt ।
anyadeva tadviditādatho aviditādadhi ।
iti śuśruma pūrveṣāṃ ye nastad vyācacakṣire ॥

There sight travels not, nor speech, nor the mind. We know It not nor can distinguish how one should teach of It: for It is other than the known; It is there above the unknown. It is so we have heard from men of old who declared That to our understanding.

Sri Aurobindo · CWSA 18, p. 5