Manusmriti

siva.sh/manusmriti/11/238

यद् दुस्तरं यद् दुरापं यद् दुर्गं यच्च दुष्करम् । सर्वं तु तपसा साध्यं तपो हि दुरतिक्रमम् ॥ २३८ ॥

sanskrit

Whatever is hard to be traversed, whatever is hard to be attained, whatever is hard to be reached, whatever is hard to be performed, all (this) may be accomplished by austerities; for austerity (possesses a power) which it is difficult to surpass.

english translation

yad dustaraM yad durApaM yad durgaM yacca duSkaram | sarvaM tu tapasA sAdhyaM tapo hi duratikramam || 238 ||

hk transliteration by Sanscript