Repetition
"Excellence is an art won by training and habituation. We do not act rightly because we have virtue or excellence, but we rather have those because we have acted rightly. We are what we repeatedly do. Excellence, then, is not an act but a habit." - Aristotle
"Progress, far from consisting of change, depends on retentiveness... Those who cannot remember the past are condemned to fulfill it." - Santayana, George (1863-1952) in 'Life of Reason'