Mahabharata 12.210.16

प्रतापस्तपसो ज्ञानं लोके संशब्दितं तपःरजस्तमोघ्नं यत्कर्म तपसस्तत्स्वलक्षणम्

pratāpastapaso jñānaṃ loke saṃśabditaṃ tapaḥrajastamoghnaṃ yatkarma tapasastatsvalakṣaṇam

Our plain-language meaning of this verse is waiting for scholar review.