Kaṭha Upaniṣad 1.12

1.12

svargātyupāyāgnividyāṃ yatastvaṃ jānāsi atastanme prayacchetyāha — sa tvaṃ iti | sarvavittvena yaḥ prathitaḥ sa tvam | he mṛtyo niṣkāmabuddhyā svāśramācārasaṃpannaiḥ yo gantavyaḥ so'yaṃ brahmalokaḥ svargaḥ | 1tatprāpakaṃ jñānaṃ svargyam | agniṃ agnividyāparijñānam | tadvidyāṃ adhyeṣi yathāvajjānāsītyarthaḥ | yataḥ 2svargo loko yeṣāṃ te svargalokāḥ parameśvarārpaṇadhiyā satkarmānuṣṭhātāro brahmalokasaṃbandhi amṛtatvaṃ bhajante ataḥ śraddadhānāya mahyaṃ agnividyāṃ brūhi | tat etat agnivijñānaṃ dvitīyena vareṇa tvāṃ vṛṇe prārthaya ityarthaḥ |
mayoktārthaśravaṇataḥ kṛtakṛtyo bhavasīti tvāmahaṃ manye ityāha—etat iti | yat etat mayoktamātmatattvaṃ yastvaṃ śrutvā samyagātmabhāvena parigṛhya upādāya yaḥ kaścana vā martyo maraṇadharmā taddṛṣṭyā ātmānātmāyamānadharmādharmayormadhye svātmamātrāvaśeṣaṇadharmārdanapetaṃ dharmyaṃ adharmarūpaśarīrādeḥ pravṛdya pṛthakkṛtya adharmāpahnavasiddhaṃ aṇuṃ niṣpratiyogikasūkṣmaṃ svamātratayā modanīyaṃ āpyāparokṣatayā labdhvā sa tvamanyo vā modate | tadetadevaṃvidhaṃ naciketasaṃ tvāṃ prati muktaprāpaṇīyasadma vikaḷebarakaivalyaveśma vivṛtaṃ apāvṛtakavāṭaṃ manye brahmamātrāvasthānavidehakaivalyabhājanaṃ tvāṃ manya ityabhiprāyaḥ |