3.21 यद्यत् whatsoever, आचरति does, श्रेष्ठः the best, तत्तत् that, एव only, इतरः the other, जनः people, सः he (that great man), यत् what, प्रमाणम् standard (authority, demonstration), कुरुते does, लोकः the world (people), तत् that, अनुवर्तते follows.Commentary: Man is a social animal. He is an imitating animal too. He takes his ideas of right and wrong from those whom he regards as his moral superior. Whatever a great man follows, the same is considered as an authority by his followers. They try to follow him. They endeavour to walk in his footsteps.