The Katha Upanishad with Shankara’s Commentary
एष तेऽग्निर्नचिकेतः स्वर्ग्यो यमवृणीथा द्वितीयेन वरेण ।
एतमग्निं तवैव प्रवक्श्यन्ति जनासस्तृतीयं वरं नचिकेतो वृणीष्व ॥ १९ ॥
eṣa te'gnirnaciketaḥ svargyo yamavṛṇīthā dvitīyena vareṇa ।
etamagniṃ tavaiva pravakśyanti janāsastṛtīyaṃ varaṃ naciketo vṛṇīṣva ॥ 19 ॥
19. This is thy fire, Oh Nachikêtas, which leads to heaven and which you craved for, by the second boon; people will call this fire thine alone; Oh Nachikêtas, demand the third boon.
Com.—Oh Nachikêtas, this is the fire leading to heaven that you craved for, by the second boon; and the expression ‘the boon has been granted’ should be supplied by way of concluding what has been said again, people will call this fire by thy name; this is the fourth boon which I granted being delighted with thee; Oh Nachikêtas, demand the third boon. The meaning is that Death considered himself a debtor if that were not granted..