What is a virtue?

The question of what exactly a virtue *is* has come up in the contributing comments of my Symposium question. Since this is a key issue in Plato studies, I think it would be helpful to expand on this matter. I will provisionally define virtue/arete (at least this is how I understand the Greeks to define it) as “a power of sustained excellence in purposive activity.” Whatever has a functional aim (whether thing, or craft or instrument or tool) has a virtue specific to it. I am able to drive a nail with a hammer (sort of), but a carpenter with skill can drive it well. A brick can be used to (more…)