मूढग्राहेणात्मनो यत्पीडया क्रियते तपः।
परस्योत्सादनार्थं वा तत्तामसमुदाहृतम्।।17.19।।
17.19. What austerity is practised with foolish obstinacy [and] with self-torture only in order to destroy other person-that is declared to be of the Tamas.
17.17-19 Sraddhaya etc. upto tamasam udahrtam. There is faith in all the three-fold austerity. the faith of a man of the Sattva is full of austerity itself. The faith of a man of the Rajas is in the Rajas i.e, showing (or hyprocricy) etc. But, the faith (or desire) of a man well established in the Tamas is merely in ruining others. Thus the sage speaks of all the three-fold austerity practised with faith.
Moodhagraahenaatmano yat peedayaa kriyate tapah; Parasyotsaadanaartham vaa tattaamasamudaahritam.
mūḍha—those with confused notions; grāheṇa—with endeavor; ātmanaḥ—one’s own self; yat—which; pīḍayā—torturing; kriyate—is performed; tapaḥ—austerity; parasya—of others; utsādana-artham—for harming; vā—or; tat—that; tāmasam—in the mode of ignorance; udāhṛitam—is described to be