Shloka 17
Abhaya-Itihāsa: Karma, Indriyas, and the Non-sensory Brahman
Brāhmaṇī–Brāhmaṇa Saṃvāda
प्राणानामायतत्वेन तमुदान प्रचक्षते । तस्मात् तपो व्यवस्यन्ति मद्गतं ब्रह्म॒वादिन:
prāṇānām āyatatvena tam udāna pracakṣate | tasmāt tapo vyavasyanti madgataṁ brahmavādinaḥ ||
伐由说道：“因其为诸生命之气的依处与根基，智者称此原理为‘乌达那’（Udāna）。因此，通达吠陀者立定苦行之志，视其为安立于我之中——向我而行，并在我之临在中确立。”
वायुदेव उवाच
Educational Q&A
Udāna is identified as the sustaining basis connected with the vital breaths, and true austerity (tapas) is presented as a disciplined resolve grounded in Vāyu’s principle—linking spiritual practice with mastery and understanding of prāṇa.
Vāyudeva is speaking doctrinally, explaining a subtle physiological-spiritual concept: why the wise name a particular vital function ‘Udāna’ and how Veda-knowers, on that basis, commit themselves to tapas as a practice established in Vāyu.