Shloka 21
Varṇasaṃkara: Causes, Classifications, and Conduct-based Recognition (वर्णसंकरः—हेतु-जाति-आचारनिर्णयः)
यद्यप्याचरित: कैश्रिन्नैष धर्म: सनातन: । अन्येषामपि दृश्यन्ते लोकत: सम्प्रवृत्तय:
yady apy ācaritaḥ kaiścin naiṣa dharmaḥ sanātanaḥ | anyeṣām api dṛśyante lokataḥ sampravṛttayaḥ ||
毗湿摩说道：纵然有些人曾行此等举止，那也并非永恒之法（达摩）。在他人之中亦可见许多行为模式，不过是因世俗习惯与社会成规而起。
भीष्म उवाच
Educational Q&A
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.