In this material world, in order to maintain the body one has to work. Human society is divided, according to work, into four divisions of social order—brāhmaṇa, kṣatriya, vaiśya and śūdra. The brāhmaṇa class or intelligent class is working in one way, the kṣatriya or administrative class is working in another way, and the mercantile class and the laborers are all tending to their specific duties. In the human society, whether one is a laborer, merchant, administrator or farmer, or even if one belongs to the highest class and is a literary man, a scientist or a theologian, he has to work in order to maintain his existence.