Madhvacharya's Dvaita Vedanta and translation of Sarvamoola containing Bhagavad Gita, Upanishads, and Brahmasutra.

Kāthakopaniṣat Bhāshya (काठकोपनिषत् )

In the heavenly world, there is no fear of any kind; there, you are not afflicted by old age. Having crossed both hunger and thirst, one who has transcended sorrow rejoices in the heavenly world.

O Death, you know that heavenly fire; tell it to me, who is faithful. The heavenly worlds attain immortality through it. This I choose as my second boon.

Lord Hari, being foremost among all, is associated with the Naciketa fire.

"Lord Hari being foremost and supreme among all fires, is associated with the Naciketa fire."

बहुचित्रजगद्बहुधाकरणात् परशक्तिरनन्तगुणः परमः ।
सुखरूपममुष्य पदं परमं स्मरतस्तु भविष्यति तत्सततम् ॥
"The one who has created this variegated vast universe with varied forms has infinite power and is of infinite auspicious qualities. He certainly bestows the highest state of bliss to those who meditate on his ever happy essence." -Dwādasha stōtra 4.3

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