Katha Upanishad Verse 1.1.14

Yama, the Lord of Death, instructs Nachiketas on the nature of the sacred fire. He explains that this fire is the path to heaven, the support of the universe, and is subtly seated within the heart (“the cavity”).

Sanskrit Verse

प्र ते ब्रवीमि तदु मे निबोध स्वर्ग्यमग्निं नचिकेतः प्रजानन् । अनन्तलोकाप्तिमथो प्रतिष्ठां विद्धि त्वमेतं निहितं गुहायाम् ॥ १४ ॥

Transliteration

pra te bravīmi tadu me nibodha svargyamagniṃ naciketaḥ prajānan | anantalokāptimatho pratiṣṭhāṃ viddhi tvametaṃ nihitaṃ guhāyām || 14 ||

Translation

I will tell thee well; attend to me, Oh Nachiketas, I know the fire leading to heaven; know the fire which leads to heaven and also the support of the universe and which is seated in the cavity.