Manusmriti
इत्येतत् तपसो देवा महाभाग्यं प्रचक्षते । सर्वस्यास्य प्रपश्यन्तस्तपसः पुण्यमुत्तमम् ॥ २४४ ॥
The gods, discerning that the holy origin of this whole (world) is from austerity, have thus proclaimed the incomparable power of austerity.
english translation
ityetat tapaso devA mahAbhAgyaM pracakSate । sarvasyAsya prapazyantastapasaH puNyamuttamam ॥ 244 ॥
hk transliteration by Sanscript