Mahabharata 3.104.3

युधिष्ठिर उवाच · yudhiṣṭhira uvāca

कथं वै ज्ञातयो ब्रह्मन्कारणं चात्र किं मुनेकथं समुद्रः पूर्णश्च भगीरथपरिश्रमात्

kathaṃ vai jñātayo brahmankāraṇaṃ cātra kiṃ munekathaṃ samudraḥ pūrṇaśca bhagīrathapariśramāt

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