Mantra 22

देवैरत्रापि विचिकित्सितं किल त्वं च मृत्यो यन्न सुज्ञेयमात्थ ।वक्ता चास्य त्वादृगन्यो न लभ्यो नान्यो वरस्तुल्य एतस्य कश्चित् ॥ २२ ॥

In plain words

Even the gods, you say, had doubt about this; and you too, Death, say this is not easily known. No speaker of it equal to you is to be found -- and no other boon is equal to this one, none whatever.