Chandogya Upanishad 6.69

स यथा तत्र नादाह्येतैतदात्म्यमिदँ सर्वं तत्सत्यँ स आत्मा तत्त्वमसि श्वेतकेतो इति तद्धास्य विजज्ञाविति विजज्ञाविति ॥ ३ ॥

6.16.3 — sa yatha tatra nadahyetaitadatmyamidan sarvam tatsatyan sa aatma tattvamasi shvetaketo iti taddhasya vijajnaviti vijajnaviti || 3 ||

As in this case he would not be burned [because of the truth], so this whole world has that [truth] as its soul. That is Reality, That is Atman (Soul). That art thou, Svetaketu.' Then he understood it from him — yea, he understood. SEVENTH PRAPATHAKA The instruction of Narada by Sanatkumara Progressive worship of Brahma up to the Universal Soul

'जैसे वहाँ वह (सत्यनिष्ठ पुरुष) जलता नहीं — वैसे ही यह समस्त जगत् जिसकी आत्मा है, वह सत्य है, वह आत्मा है; हे श्वेतकेतो, तत् त्वम् असि।' — यह उसने उनसे समझ लिया, यह उसने समझ लिया।