KATHOPNISHADA CHAPTER 1 SHLOKA-22

                 
                                                  देवैरत्रापि विचिकित्सितं किल त्वं

                                                         च मृत्योयन्न सुज्ञेयमात्थ ।

                                                   वक्ता चास्य त्वादृगन्यो न लभ्यो

                                                   नान्योवरस्तुल्य एतस्य कश्चित् ॥ २२

                                  DEVAIR ATRAPI VICHIKITSIAM KIL TVAM

                                   CHA MRUTYO YANNA SUVIDYEAM AATTHAM |

                                   VAKTA CHA ASYA TVADRG ANYO NA LABHYO

                                  NANYO VARASTULYA ETASYA KASCHIT ||22

               OH GOD OF DEATH, YOU SAY THAT EVEN GODS HAVE DOUBTS

ABOUT THIS (QUESTION), SO WOULD BE BETTER TO TELL THAN YOU (ABOUT THIS)

AND NO OTHER BOON CAN BE EQUAL TO THIS (ANSWERING MY QUESTION) -22

         This is simple one  and not much can be added to the straight meaning . Nachiket was tempted by Yam to ask for something else, but he does not want anything else  and wants the answer . Lord of death - YAMA will be the best or mos suitable person to answer as to what happens after death.So Nachiket is insisting though politely that Yama should teach him as to what happens after death and he does not want any other boon .