State Quotes in Nicomachean Ethics
First, then, we should observe that these sorts of states naturally tend to be ruined by excess and deficiency […] The same is true, then, of temperance, bravery, and the other virtues. For if, for instance, someone avoids and is afraid of everything, standing firm against nothing, he becomes cowardly; if he is afraid of nothing at all and goes to face everything, he becomes rash. Similarly, if he gratifies himself with every pleasure and abstains from none, he becomes intemperate; if he avoids them all, as boors do, he becomes some sort of insensible person. Temperance and bravery, then, are ruined by excess and deficiency, but preserved by the mean.