ChU 3.14.1
सर्वं खल्व् इदं ब्रह्म तज्जलान् इति शान्त उपासीत । अथ खलु क्रतुमयः पुरुषो यथाक्रतुर् अस्मिंल् लोके पुरुषो भवति तथेतः प्रेत्य भवति । स क्रतुं कुर्वीत
sarvaṃ khalv idaṃ brahma tajjalān iti śānta upāsīta | atha khalu kratumayaḥ puruṣo yathākratur asmiṃl loke puruṣo bhavati tathetaḥ pretya bhavati | sa kratuṃ kurvīta
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
All this is Brahman (n.) Let a man meditate on that (visible world) as beginning, ending, and breathing in it (the Brahman). Now man is a creature of will. According to what his will is in this world, so will he be when he has departed this life. Let him therefore have this will and belief:
Translated by F. Max Müller