How to apologize correctly. This is phrased in the context of marriage, but I think these rules of thumb are important for any kind of relationship with another human being. it's a harsh, but nice, reminder to be a better person.
“They caused the first wound, but you are causing the rest; this is what not forgiving does. They got it started but you keep it going. Forgive and let it go, or it will eat you alive. You think they made you feel this way, but when you won’t.