ChU 6.13.3
स य एषो ऽणिमैतद् आत्म्यम् इदं सर्वम् । तत् सत्यम् । स आत्मा । तत् त्वम् असि श्वेतकेतो इति । भूय एव मा भगवान् विज्ञापयत्व् इति । तथा सोम्येति होवाच
sa ya eṣo 'ṇimaitad ātmyam idaṃ sarvam | tat satyam | sa ātmā | tat tvam asi śvetaketo iti | bhūya eva mā bhagavān vijñāpayatv iti | tathā somyeti hovāca
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
'That which is the subtile essence, in it all that exists has its self. It is the True. It is the Self, and thou, O Svetaketu, art it.' 'Please, Sir, inform me still more,' said the son. 'Be it so, my child,' the father replied.
Translated by F. Max Müller