From The Art and Popular Culture Encyclopedia
Discipline denotes any training intended to develop moral character, or produce a pattern of behaviour. "Discipline" in this context, while often thought to be a coercive mechanism, can be a collaborative process of building consensus regarding accepted behavior within institutions and society.
Self-discipline is the ability to exercise control over one's behaviour or emotions (see self control and willpower). Self-discipline is to some extent a substitute for motivation, when one uses reason to determine a best course of action that opposes one's desires. Lord Alfred Tennyson commented on self-discipline in this way: "Self-reverence, self-knowledge, self-control. These three alone lead to sovereign power", with"sovereign power meaning self-discipline.