Varṇasaṃkara: Causes, Classifications, and Conduct-based Recognition (वर्णसंकरः—हेतु-जाति-आचारनिर्णयः)
यद्यप्याचरित: कैश्रिन्नैष धर्म: सनातन: । अन्येषामपि दृश्यन्ते लोकत: सम्प्रवृत्तय:,यद्यपि कुछ पुरुषोंने ऐसा आचरण किया है; परंतु यह सनातन धर्म नहीं है। दूसरे लोगोंमें भी लोकाचारवश बहुत-सी प्रवृत्तियाँ देखी जाती हैं
yady apy ācaritaḥ kaiścin naiṣa dharmaḥ sanātanaḥ | anyeṣām api dṛśyante lokataḥ sampravṛttayaḥ ||
Bhishma said: Even if certain people have practiced such conduct, it is not the eternal law of dharma. Among others too, many patterns of behavior are seen arising merely from worldly custom and social convention.
भीष्म उवाच
Bhishma distinguishes true, enduring dharma from mere imitation of what some people do. Socially prevalent behavior (lokācāra) can exist widely, yet it does not automatically become 'sanātana dharma'; ethical judgment must look beyond custom to principled righteousness.
In Bhishma’s instruction on dharma, he cautions the listener not to justify an action simply because it has precedent or is commonly observed. He frames certain behaviors as products of worldly convention rather than authoritative moral law.