...here also forgiving does not mean excusing. Many people seem to think it does. They think that if you ask them to forgive someone who has cheated or bullied them you are trying to make out that there was really no cheating or bullying. But if that were so, there would be nothing to forgive. (This doesn't mean that you must necessarily believe his next promise. It does mean that you must make every effort to kill every taste of resentment in your own heart - every wish to humiliate or hurt him or to pay him out.)
C.S. Lewis, Fern Seed And Elephants
forgiveness