Ācāra-vidhi (Rules of Conduct) — Yudhiṣṭhira’s Inquiry and Bhīṣma’s Normative Catalogue
प्रयत्ने कर्मणि बले य एकस्त्रिषु वर्तते । उदान इति त॑ प्राहुरध्यात्मविदुषो जना:,जिस एक ही वायुकी प्रयत्न, कर्म और बल तीनोंमें प्रवृत्ति होती है, उसे अध्यात्मतत्त्वके जाननेवाले पुरुषोंने उदान कहा है
prayatne karmaṇi bale ya ekas triṣu vartate | udāna iti taṁ prāhur adhyātmaviduṣo janāḥ ||
Bharadvāja said: “That single vital wind which operates in three spheres—effort, action, and strength—is called Udāna by those who know the truth of the Self. Thus, inner discipline and bodily power are understood as expressions of one subtle life-force when rightly discerned.”
भरद्वाज उवाच
The verse identifies Udāna as the single vital force that manifests as effort, action, and strength—teaching that bodily capacities and disciplined striving are rooted in a subtle inner principle understood by adhyātma-knowers.
In the Śānti Parva’s instructional discourse, Bharadvāja explains a point of adhyātma (inner doctrine) by defining Udāna among the vital winds, describing its functional presence in human exertion and power.