Kaṭha Upaniṣad 1.6.1

1.6.1

śrīmadvaivasvatācāryo yadāha naciketase | kalaye tatpadaṃ brahma svāvaśeṣadhiyānvaham || iha khalu kṛṣṇayajurvedāntargatakaṭhaśākhāyāṃ darśapūrṇamāsādyagnicayanāntaṃ karmavartma vispaṣṭamabhihitam | sarvakarmāśrayabhūtahiraṇyagarbhopāsanāni cābhihitāni | tatra sakāmasya " kiṃcidvikalaṃ karma phalopadhāyakaṃ na bhavati " iti vacanataḥ prātisvikena karma jñānaṃ vā karmasamuccitajñānaṃ vā yathāvadanuṣṭhitaṃ sat punarāvṛttyarhacandralokaprāpakaṃ bhavati | niṣkāmasya tu tadvaiparītyenācirādinā brahmalokāptiścittaśuddhiprāpyasaṃnyāsapūrvakabrahmajijñāsā vodeti | tādṛśajijñāsorātmatattvapratipattaye vallīṣaṭkajuṣṭakāṭhakopaniṣadānnāyate | naciketomṛtyupraśnaprativacanarūpeyamākhyāyikā tu vakṣyamāṇavidyāstutyarthā | vakṣyamāṇabrahmavidyābhivyaktihetukāṭhakopaniṣadaḥ sukhapratipattyarthamalpagranthato vivaraṇamupakramyate | vṛttamanukīrttayati-uśan ityādinā | vājaṃ annam | taddānaprayuktaśravo yaśo yasya so'yaṃ vājaśravāḥ | rūḍhito vā | asyāpatyaṃ vājaśravasaḥ | viśvajidyāgaphalaṃ uśan kāmayamānassan viśvajidyāgāvasāne sarvavedasaṃ svārjitasarvasvaṃ dadau | ha vā iti vṛttārthasmaraṇārthau nipātau | tasya ha kila yajamānasya naciketā nāma satputra āsa babhūvetyarthaḥ |