अशास्त्रविहितं घोरं तप्यन्ते ये तपो जनाः।दम्भाहङ्कारसंयुक्ताः कामरागबलान्विताः।।17.5।।
aśhāstra-vihitaṁ ghoraṁ tapyante ye tapo janāḥ dambhāhankāra-sanyuktāḥ kāma-rāga-balānvitāḥ
Those men who practice terrific austerities not prescribed by the scriptures, given to hypocrisy and egoism, driven by the force of lust and attachment.