देवैरत्रापि विचिकित्सितं किल त्वं च मृत्यो यन्न सुज्ञेयमात्थ । वक्ता चास्य त्वादृगन्यो न लभ्यो नान्यो वरस्तुल्य एतस्य कश्चित् ॥

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English Translation

Nachiketa said: O Death, even the gods have their doubts about this subject; and you have declared it to be not easy to understand. But another teacher like you cannot be found and surely no other boon is comparable to this. 

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English Commentary

Thus addressed, Nachikêtas said, ‘I have heard from yourself that even the gods had doubt on this point and you say, Oh Death, that the true nature of the âtman is not easy to know. As this cannot be known even by the learned, another, learned like you 2 to explain this, cannot be found, though sought.’ This boon also is a means to the attainment of emancipation and there is no other boon which can at all weigh with this. The meaning is that other boons bear only transitory fruits.

Sri Shankaracharya