Mahabharata 9.49.22

असितो देवलो राजंश्चिन्तयामास बुद्धिमान्दृष्टः प्रभावं तपसो जैगीषव्यस्य योगजम्

asito devalo rājaṃścintayāmāsa buddhimāndṛṣṭaḥ prabhāvaṃ tapaso jaigīṣavyasya yogajam

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