There must be intelligent class of men, there must be martial spirit, administrative class of men, there must be business minded men. There must be śūdras, they do not know anything, they want to serve only, master. So therefore, scientifically it is divided. Mukha bahu rupadebhyo(?). Just like in your body you find scientifically it is designed by God or Lord Brahmā: "This is brain department, this is arms department, this is belly department, this is leg department." All of them required. You cannot avoid any one of them. This is called sva-dharma. One must be fixed up to his own position. That is the real perfect social system.
Now here it is said, tyaktvā sva-dharmam. This is material division. The spiritual is different. So far... I am combination of matter and spirit; so far my body is concerned, there is division. But when I come to Kṛṣṇa consciousness, it is not like that. That is simply for everyone. Either he's externally a brāhmaṇa, kṣatriya, vaiśya, śūdra, American, Indian, black, white, it doesn't matter. That is bodily. When you come to the spiritual platform, that is one. Because spirit is one.