Kauṣītaki Upaniṣad 3.15-2

3.15-2

pra. - kathaṃ prāṇaśarīrakasyāyuṣṭvāmṛtatve ityāśaṅakcāha - śarīre prāṇasthiterūcchvāsādi - lakṣaṇāyussādhanatvādāyuḥ prāṇaḥ | lokāntare cirasthāyitvarūpāmṛtatvaprāpteḥ prāṇādhīnopāyānuṣṭhānasādhyatvāt prāṇasyāmṛtatvam |
ata āyuṣṭvāmṛtatve prāṇasyopapadyete | taddvārā paramātmanaścopapatteḥ āyuṣdvāmṛtatvābhyāṃ prāṇaśarīraka - brahmaṇa upāsanamupapadyate | yadvā vyāsāryoktarītyā taṃ māmāyuriti vākye māmiti jīvaśiṣṭatā ucyate āyuriti prāṇaviśiṣṭatā | āyuḥ prāṇa iti hyanantarameva śravāṇāt āyuramṛtamiti svena rūpeṇāvasthitiḥ | ataḥ (evañca) asminneva vākye svena rūpeṇa cidacidviśiṣṭatayā ca trividhopāsanaṃ vidhīyate | ato nopāsanā - trayavidhikṛtavākyabheda iti draṣṭavyam ||