ChU 7.3.2
स यो मनो ब्रह्मेत्य् उपास्ते । यावन् मनसो गतं तत्रास्य यथाकामचारो भवति यो मनो ब्रह्मेत्य् उपास्ते । अस्ति भगवो मनसो भूय इति । मनसो वाव भूयो ऽस्तीति । तन् मे भगवान् ब्रवीत्व् इति
sa yo mano brahmety upāste | yāvan manaso gataṃ tatrāsya yathākāmacāro bhavati yo mano brahmety upāste | asti bhagavo manaso bhūya iti | manaso vāva bhūyo 'stīti | tan me bhagavān bravītv iti
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
'He who meditates on the mind as Brahman, is, as it were, lord and master as far as the mind reaches—he who meditates on the mind as Brahman.' 'Sir, is there something better than mind?' 'Yes, there is something better than mind.' 'Sir, tell it me.'
Translated by F. Max Müller