Brahma-vidyā: Satya–Tapas and the Enumeration of Tattvas
Arjuna–Vāsudeva framed dialogue
कथं कर्म क्रियात् साधु कथं मुच्येत किल्बिषात् । के नो मार्गा: शिवाश्र स्यु: कि सत्यं कि च दुष्कृतम्
kathaṁ karma kriyāt sādhu kathaṁ mucyeta kilbiṣāt | ke no mārgāḥ śivāśrasyuḥ ki satyaṁ ki ca duṣkṛtam ||
风神曰:“当如何正当地行事作业?人如何得以脱离罪垢?哪些道路于我等为吉祥、能致福祉?何为真实?何为恶行?”
वायुदेव उवाच
The verse frames a classic dharma-inquiry: right performance of action (karma), release from moral fault (kilbiṣa), identification of auspicious life-paths (śiva-mārga), and discernment between truth (satya) and wrongdoing (duṣkṛta). It sets up ethical discrimination and disciplined conduct as the means to purification and welfare.
In the Ashvamedhika Parva, Vāyu-deva speaks in a questioning mode, seeking clarification on proper conduct and moral categories—how to act well, how sin is removed, which ways are beneficial, and how to distinguish truth from evil—thereby prompting an ensuing instruction on dharma.