Chandogya Upanishad 6.66

स य एषोऽणिमैतदात्म्यमिदँ सर्वं तत् सत्यँ स आत्मा तत्त्वमसि श्वेतकेतो इति भूय एव मा भगवान्विज्ञापयत्विति तथा सोम्येति होवाच ॥ ३ ॥

6.15.3 — sa ya esho'nimaitadatmyamidan sarvam tat satyan sa aatma tattvamasi shvetaketo iti bhuya eva ma bhagavanvijnapayatviti tatha somyeti hovacha || 3 ||

Then when his voice goes into his mind, his mind into his breath, his breath into heat, the heat into the highest divinity l — then, he knows not. 3. That which is the finest essence — this whole world has that as its soul. That is Reality. That is Atman (Soul). That art thou, Svetaketu.' ( Do you, Sir, cause me to understand even more.1 So be it, my dear/ said he. This same statement of the order of the cessation of functions on the approach of death occurs in 6. 6. 6.T6.I-] CHAXDOGYA UPANISHAD

'जो यह सूक्ष्म है — यह समस्त जगत् जिसकी आत्मा है, यह सत्य है, यह आत्मा है; हे श्वेतकेतो, तत् त्वम् असि।' (श्वेतकेतु —) 'हे भगवन्, मुझे और समझाइए।' पिता — 'हे सौम्य, ऐसा ही हो।'