A mistake is simply another way of doing things.
Few of the many wise apothegms which have been uttered have prevented a single foolish action.
Thomas B. Macaulay
From the errors of others, a wise man corrects his own.
Give me a lever long enough and a fulcrum on which to place it, and I shall move the world.
By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest.