Chandogya Upanishad (with commentary) · Chapter 7.16

ChUpBh_7,15.4 tasmātprāṇo hyevaitāni pitrādīni sarvāṇi bhavati calāni sthirāṇi ca /
sa vā eṣa prāṇavidevaṃ yathoktaprakāreṇa paśyanphalato 'nubhavannevaṃ manvāna upapattibhiścintayannevaṃ vijānannupapattibhiḥ saṃyojyaivameveti niścayaṃ kurvannityarthaḥ /
mananavijñānābhyāṃ hi saṃbhūtaḥ śāsrārtho niścito dṛṣṭo bhavet /
ata evaṃ paśyannativādī bhavati nāmādyāśāntamatītya vadanaśīlo bhavatītyarthaḥ /
taṃ cedbrūyustaṃ yadyevamativādinaṃ sarvadā sarvaiḥ śabdairnāmādyāśāntamatītya vartamānaṃ prāṇamevaṃ vadantamevaṃ paśyantamativadanaśīlamativādinaṃ brahmādistambaparyantasya hi jagataḥ prāṇa ātmāhamiti bruvāṇaṃ yadi brūyurativādyasīti /
bāḍhamativādyasmīti brūyānnāpahnuvīta /
kasmāddhyasāvapahnuvīta /
yatprāṇaṃ sarveśvaramayamahamasmītyātmatvenopagataḥ //4//
iti cchāndogyopaniṣadi saptamādhyāyasya pañcadaśaḥ khaṇḍaḥ
START ChUp 7,16.1
eṣa tu vā ativadati yaḥ satyenātivadati |
so 'haṃ bhagavaḥ satyenātivadānīti |
satyaṃ tveva vijijñāsitavyam iti |
satyaṃ bhagavo vijijñāsa iti