यद्दुरापं दुराराध्यं दुराधर्षं दुरुत्सहम्।

तत्सर्वं तपसा शक्यं तपो हि दुरतिक्रमम्।।

Whatever is difficult to obtain, hard to meditate upon, difficult to control and complex to endure, all that is possible by penance. Indeed the power of penance is unconquerable.