"Edward," she said softly. "Learn this from me. Holding anger is a poison. It eats you from inside. We think that hating is a weapon that attacks the person who harmed us. But hatred is a curved blade. And the harm we do, we do to ourselves.
Forgiveness is not just some nebulous, vague idea one can easily dismiss. It has to do with uniting people through practical politics. Without forgiveness there is no future. To forgive is the only way to permanently change the world.