Plato's Ethics - The Virtue of the Soul

In the republic, you do definitely have the idea that there is a rational part of the soul. And in this respect, plutarch's great opponents are the stoics who thought that the virtue of the soul consisted in being entirely rational. According to plutarch, it is completely unrealistic to have that as goal because human souls cannot get rid of their irrational part. So the best you can do is to keep it under control, to check it. That's what he tries to show in his ethical works. Can you give me an example of how plutarch’s ethical thought works in practice?