You know very well, O grandfather, that there is nothing whose power is superior to that of Penances. You should explain to us what forms the highest penance.
पितामहस्य विदितं किमन्यत् तपसो बलात्। तपसो यत्परं तेऽद्य तन्नो व्याख्यातुमर्हसि॥