Moral virtue is a concept that has its roots in ancient Greek philosophy and refers to characteristics or habits considered good and ethical behaviors. Greek philosophers like Socrates, Plato, and Aristotle extensively discussed moral virtue. Aristotle defines virtue as a "golden mean" between two vices; for example, courage is the middle ground between recklessness and cowardice. Plato considers the soul to be composed of three parts: rational, spirited(or irascible), and appetitive. He believes that only the rational part is simple and immortal, while the other two parts are added when the soul attaches to the body, making them material and perishable. Mulla Sadra, on the other hand, views the soul as possessing faculties, which are the soul's degrees and stations. Due to its inherent simplicity, the soul encompasses all of these faculties. Both Plato and Mulla Sadra consider the principal virtues of the soul to be the four cardinal virtues: wisdom, courage, temperance (self-control), and justice. This article employs a descriptive-comparative method to examine and contrast the viewpoints of Plato and Mulla Sadra regarding virtue and moral dispositions, and their role in human happiness. It demonstrates that both philosophers, firstly, view the soul as having parts or faculties and enumerate wisdom, courage, temperance, and justice as the soul's main virtues. Secondly, it shows that Mulla Sadra's ideas concerning the soul and ethics are influenced by Plato's views.