To explain the nature of human beings and their necessary characteristics for ethical acts is one of the most important issues so as to achieve an ethical theory. Seyyed Morteza, as one of the founders of Shiite theology that is the main source for theoretical discussions of former scholars, had a somatic stance at human beings which naturally impacted on the way he presented his ethical theory. In addition to investigating and criticizing the reality of humans from Morteza’s viewpoint and exploring human qualities in his attitude, this article examined its effects in ethics through descriptive-analytic methodology and based on library information, and proved his theory about moral necessity, namely, virtue-centered deontology.