Allamah Tabatabai deals with three kinds of ethics, that is, Greek, religious and Quranic ethics and seeks the difference of these three levels of ethics in the source of their moral motivation. If admiration of society, acquisition of divine reward and fear of eschatological retribution or attraction of God's pleasure and love are fundamental incentive to provoke man into a moral action, all of them, in a way, will have to do with the discussion of motivation source, so that if the source of motivation changes, the type of moral action will change too. On the basis of his special attitude towards man, Allamah introduces an external motivation for any view as the supporter of doing a moral action. Without denying the Greek and religious ethics, he emphasizes Quranic ethics and believes that the highest motivation for moral actions is acquisition of Almighty God's pleasure and love. Since the type of anthropology determines the type of ethics, in the light of Quranic ethics, man desires not only God, but also he can't desire anybody save God. Quranic ethics are based on love accompanied by knowledge and desire. On the basis of this type of anthropology, a moral perfect man is the seeker of truth in cognitive realm, lovemaking in emotional realm and benevolent in voluntary realm. For the acquisition of nearness to God, Allamah emphasizes God's love among these three moral indices.In this study, elucidating moral levels in Tabatabai's thought, analyzing anthropological foundation and explaining moral motivation governed over them, we have studied the source of moral motivation in any level.