Whatever is difficult to do whatever is dificult to conquer whatever is difficult to attain, and whatever is difficult to cross, can all be done with the help of penances. Of all things, penaces are of very superior power.
दुरन्वयं दुष्प्रधर्षं दुरापं दुरतिक्रमम्। सर्वे वै तपसाभ्येति तपो हि बलवत्तरम्॥