Mahabharata 3.259.15

जातस्पर्धास्ततस्ते तु तपसे धृतनिश्चयाःब्रह्माणं तोषयामासुर्घोरेण तपसा तदा

jātaspardhāstataste tu tapase dhṛtaniścayāḥbrahmāṇaṃ toṣayāmāsurghoreṇa tapasā tadā

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