Kaṭha Upaniṣad 3.14

3.14

evaṃ puruṣe ātmani sarvaṃ pravilāpya nāmarūpakarmatrayaṃ yanmithyājñānavijṛmbhitaṃ kriyākārakaphalalakṣaṇaṃ svātmayāthātmyajñānena marīcyudakarajjusarpagaganamalānīva marīcirajjugaganasvarūpadarśanenaiva svasthaḥ praśāntaḥ kṛtakṛtyo bhavati yataḥ, atastaddarśanārthamanādyavidyāprasuptāḥ uttiṣṭhata he jantavaḥ, ātmajñānābhimukhā bhavata ; jāgrata ajñānanidrāyā ghorarūpāyāḥ sarvānarthabījabhūtāyāḥ kṣayaṃ kuruta | katham ? prāpya upagamya varān prakṛṣṭānācāryāṃstattvavidaḥ, tadupadiṣṭaṃ sarvāntaramātmānamahamasmīti nibodhata avagacchata; na hyupekṣitavyamiti śrutiranukampayā āha mātṛvat, atisūkṣmabuddhiviṣayatvājjñeyasya | kimiva sūkṣmabuddhiriti, ucyate- kṣurasya dhārā agraṃ niśitā tīkṣṇīkṛtā duratyayā duḥkhenātyayo yasyāḥ sā duratyayā | yathā sā padbhyāṃ durgamanīyā tathā durgaṃ duḥsaṃpādyamityetat; pathaḥ panthānaṃ tat taṃ jñānalakṣaṇaṃ mārgaṃ kavayaḥ medhāvino vadanti | jñeyasyātisūkṣmatvāttadviṣayasya jñānamārgasya duḥsaṃpādyatvaṃ vadantītyabhiprāyaḥ ||