Kaṭha Upaniṣad 4.2

4.2

yattāvatsvābhāvikaṃ parāgevānātmadarśanaṃ tadātmadarśanasya pratibandhakāraṇamavidyā tatpratikūlatvādyā ca parāgevāvidyopapradśiteṣu dṛṣṭādṛṣṭeṣu bhogeṣu tṛṣṇā tābhyāmavidyātṛṣṇābhyāṃ pratibaddhātmadarśanāḥ parācaḥ bahirgatāneva kāmān kāmyānviṣayān anuyanti anugacchanti bālāḥ alpaprajñāḥ te tena kāraṇena mṛtyoḥ avidyākāmakarmasamudāyasya yanti gacchanti vitatasya vistīrṇasya sarvato vyāptasya pāśaṃ pāśyate badhyate yena taṃ pāśaṃ dehendriyādisaṃyogaviyogalakṣaṇam | anavarataṃ janmamaraṇajarārogādyanekānarthavrātaṃ pratipadyanta ityarthaḥ | yata evam atha tasmāt dhīrāḥ vivekinaḥ pratyagātmasvarūpāvasthānalakṣaṇam amṛtatvaṃ dhruvaṃ viditvā | devādyamṛtatvaṃ hyadhruvam , idaṃ tu pratyagātmasvarūpāvasthānalakṣaṇaṃ dhruvam , 'na karmaṇā vardhate no kanīyān' iti śruteḥ | tadevaṃbhūtaṃ kūṭasthamavicālyamamṛtatvaṃ viditvā adhruveṣu sarvapadārtheṣu anityeṣu nirdhārya, brāhmaṇā iha saṃsāre 'narthaprāye na prārthayante kiṃcidapi pratyagātmadarśanapratikūlatvāt | putravittalokaiṣaṇābhyo vyuttiṣṭhantyevetyabhiprāyaḥ ||