Mahabharata — Ashvamedhika Parva, Shloka 15
Adhyāya 51: Kṛṣṇa’s Leave-Taking and Departure for Dvārakā (द्वारकागमनानुमति)
तपसश्चानुपूव्येंण फलमूलाशिनस्तथा । त्रैलोक्यं तपसा सिद्धा: पश्यन्तीह समाहिता:
tapasas cānupūrvyena phalamūlāśinas tathā | trailokyaṃ tapasā siddhāḥ paśyantīha samāhitāḥ ||
风神伐由说道：“同样地，凭借循序渐进的苦行修持，并以果实与根茎为食，那些由苦行而圆满的成就圣者（悉地者），在此安住，心一境性，便能依次亲证三界的一切真实。由是可知，内在净化与恒常自制，方为通达高智之道。”
वायुदेव उवाच
Educational Q&A
True higher perception arises from disciplined tapas practiced gradually, supported by simplicity (such as a fruits-and-roots diet) and sustained mental concentration; spiritual knowledge is presented as the fruit of ethical self-restraint and inner steadiness.
Vāyu explains how perfected sages, through sequential austerities and a restrained ascetic lifestyle, become samāhita (mentally collected) and thereby gain direct insight into the three worlds, describing the mechanism of spiritual accomplishment rather than a physical journey.