You may learn rules intellectually, and therefore you may learn or forget them very quickly. But virtues are habits of feeling, and these are much harder to learn or to forget. A fine violin that has not been played for many years will not stay in tune, and when it is first played it will have an ugly sound. A superior instrument must be played well, year after year, for it to sound beautiful. So it is with moral character. You may have as good equipment as anyone, but if your feelings have not been well played upon over the years, you will not stay in tune, and you will not respond well to life’s challenges.
Woodruff, Paul. Reverence: Renewing a Forgotten Virtue. New York: Oxford University Press, 2001. p.6