If then, as we say, good craftsmen look to the mean as they work, and if virtue, like nature, is more accurate and better than any form of art, it will follow that virtue has the quality of hitting the mean. I refer to moral virtue [not intellectual], for this is concerned with emotions and actions, in which one can have excess or deficiency or a due mean.
AristotleWe assume therefore that moral virtue is the quality of acting in the best way in relation to pleasures and pains, and that vice is the opposite.
Aristotle