In some of his dialogues, Plato showed his teacher Socrates proposing that having phronēsis is the same as being a virtuous person. By thinking with phronēsis, a person has virtue. Therefore, all virtuousness is a form of phronēsis. In the mind of Socrates phronēsis equals virtue, they are the same thing. Being good, is to be an intelligent or reasonable person with intelligent and reasonable thoughts. Phronēsis allows a person to have moral or ethical strength.
In Plato’s Meno, Socrates explains how phronēsis, a quality synonymous with moral understanding, is the most important attribute to learn, although it cannot be taught and is instead gained through the development of the understanding of one’s own self.