Mahabharata 1.220.9

किमर्थमावृता लोका ममैते तपसार्जिताःकिं मया न कृतं तत्र यस्येदं कर्मणः फलम्

kimarthamāvṛtā lokā mamaite tapasārjitāḥkiṃ mayā na kṛtaṃ tatra yasyedaṃ karmaṇaḥ phalam

Our plain-language meaning of this verse is waiting for scholar review.