Kaṭha Upaniṣad 6.13

6.13

tasmādapohyāsadvādikṣamāsuram astītyeva ātmā upalabdhavyaḥ satkāryabuddhyādyupādhibhiḥ | yadā tu tadrahito'vikriya ātmā kāryaṃ ca kāraṇavyatirekeṇa nāsti 'vācārambhaṇaṃ vikāro nāmadheyaṃ mṛttiketyeva satyam' iti śruteḥ, tadā tasya nirupādhikasyāliṅgasya sadasadādipratyayaviṣayatvavarjitasyātmanasta-
svabhāvo bhavati | tena ca rūpeṇātmopalabdhavya ityanuvartate | tatrāpyubhayoḥ sopādhikanirupādhikayorastitvatattvabhāvayoḥ— nirdhāraṇārthā ṣaṣṭhī—pūrvamastītyevopalabdhasyātmanaḥ satkāryopādhikṛtāstitvapratyayenopalabdhasyetyarthaḥ | paścātpratyastamitasarvopādhirūpa ātmanaḥ tattvabhāvaḥ viditāviditābhyāmanyo'dvayasvabhāvaḥ neti netītyasthūlamanaṇvahrasvamadṛśye'nātmye nirukte'nilayana ityādiśrutinirdiṣṭaḥ prasīdati abhimukhībhavati | ātmaprakāśanāya pūrvamastītyupalabdhavata ityetat ||