ARISTOTLE ON SELF-DISCIPLINE
We are the sum of our actions, Aristotle tells us, and therefore our habits make all the difference. And what is the best way to practice?
Aristotle's answer lies in his explanation of "the mean." In his view, correct moral behavior in any given situation lies at the midway point between the extremes of two vices. We must practice hitting the mean by determining which vice we tend toward and then consciously moving toward the other extreme, until we reach the middle.
— The Nicomachean Ethics — (Encyclopedia of 15,000 Illustrations)