Power of Restraint

Swami Vivekananda says :

It is the greatest manifestation of power — this tremendous restraint; self-restraint is a manifestation of greater power than all outgoing action. A carriage with four horses may rush down a hill unrestrained, or the coachman may curb the horses. Which is the greater manifestation of power, to let them go or to hold them? A cannonball flying through the air goes a long distance and falls. Another is cut short in its flight by striking against a wall, and the impact generates intense heat. All outgoing energy following a selfish motive is frittered away; it will not cause power to return to you; but if restrained, it will result in development of power. This self-control will tend to produce a mighty will, a character which makes a Christ or a Buddha. Foolish men do not know this secret (I, 33)