Persistence is the direct result of habit. The mind absorbs and becomes a part of the daily experiences upon which it feeds. Fear, the worst of all enemies, can be effectively cured by forced repetition of acts of courage.
Napoleon HillSelf-disciplined begins with the mastery of your thoughts. If you don't control what you think, you can't control what you do. Simply, self-discipline enables you to think first and act afterward.
Napoleon Hill