 The "Vishnu Purana" asserts that the Brahmin should study shastras, worship gods and perform libations on behalf of others, the Kshatriya should maintain arms and protect the earth, the Vaishya should engage in commerce and farming, while the Shudra should subsist by profits of trade, service other varnas and through mechanical labor.The text asserts the ethical duties of all varnas is to do good to others, never abuse anyone, never engage in calumny or untruth, never covet another person's wife, never steal another's property, never bear ill-will towards anyone, never beat or slay any human being or living being.Be diligent in the service of the gods, sages and guru, asserts the Purana, seek the welfare of all creatures, one's own children and of one's own soul.