Werset 3.213.13.23.33.43.53.63.73.83.93.103.113.123.133.143.153.163.173.183.193.203.213.223.233.243.253.263.273.283.293.303.313.323.333.343.353.363.373.383.393.403.413.423.43

Whatsoever a great man does, that the other men also do; whatever he sets up as the standard, that the world (mankind) follows.

Whatever the best person does, others do the same. Whatever standard he sets, the world follows it.

Krishna states a simple truth about human society: people imitate those they look up to. Whatever a leading person does becomes a pattern, and the standard such a person sets is followed by others. The point bears directly on Arjuna, who is one of the most admired warriors of his age. If he abandons his duty, others will take that as permission to abandon theirs. The verse explains why lokasaṅgraha, the welfare of the world, depends so much on the conduct of those in prominent positions.