But the virtues we get by first exercising them, as also happens in the case of the arts as well. For the things we have to learn before we can do them, we learn by doing them, e.g. men become builders by building and lyre players by playing the lyre; so too we become just by doing just acts, temperate by doing temperate acts, brave by doing brave acts.
AristotleTemperance and bravery, then, are ruined by excess and deficiency, but preserved by the mean.
AristotleTo say of what is that it is not, or of what is not that it is, is false, while to say of what is that it is, and of what is not that it is not, is true.
AristotleThe virtue as the art consecrates itself constantly to what's difficult to do, and the harder the task, the shinier the success.
Aristotle