प्र ते ब्रवीमि तदु मे निबोध
स्वर्ग्यमग्निं नचिकेतः प्रजानन् ।
विद्धि त्वमेतं निहितं गुहायाम् ॥ १४॥
pra te bravīmi tadu me nibodha
svargyamagniṃ naciketaḥ prajānan .
viddhi tvametaṃ nihitaṃ guhāyām .. 14..
Yama said: I know well the Fire-sacrifice, which leads to Heaven and I will explain it to you. Listen to me. Know this Fire to be the means of attaining Heaven. It is the support of the universe; it is hidden in the hearts of the wise.
Swami Vivekananda Says —
(Verses 14,15 and 16)
….a body of men made it their business to carry on these sacrifices. These were the priests, who speculated on the sacrifices, and the sacrifices became everything to them. The gods came to enjoy the fragrance of the sacrifices, and it was considered that everything in this world could be got by the power of sacrifices. If certain oblations were made, certain hymns chanted, certain peculiar forms of altars made, the gods would grant everything. So Nachiketas asks by what form of sacrifice can a man go to heaven.
The second boon was also readily granted by Yama who promised that this sacrifice should henceforth be named after Nachiketas.[Source]