Vengeance effects two purposes: it either affords compensation to the person to whom the wrong was done, or it ensures him against molestation for the future. A prince is too rich to need compensation, and his power is too evident for him to require to gain a reputation for power by causing anyone to suffer. I mean, when he is attacked and injured by his inferiors, for if he sees those who once were his equals in a position of inferiority to himself he is sufficiently avenged. A king may be killed by a slave, or a serpent, or an arrow: but no one can be saved except by someone who is greater than him whom he saves. He, therefore, who has the power of giving and of taking away life ought to use such a great gift of heaven in a spirited manner. Above all, if he once obtains this power over those who he knows were once on a level with himself, he has completed his revenge, and done all that he need to towards the punishment of his adversary: for he who owes his life to another must have lost it, and he who has been cast down from on high and lies at his enemy’s feet with his kingdom and his life depending upon the pleasure of another, adds to the glory of his preserver if he be allowed to live, and increases his reputation much more by remaining unhurt than if he were put out of the way.