"You just want cruelty to beget cruelty. You're not superior to people who were cruel to you. You're just a whole bunch of new cruel people. A whole bunch of new cruel people, being cruel to some other people, who'll end up being cruel to you. The only way anyone can live in peace is if they're prepared to forgive. Why don't you break the cycle?" - Doctor Who, "The Zygon Inversion"