Forgiveness

Take Forgiveness. Two levels here. One level: forgiveness means you should not develop feelings of revenge. Because revenge harms the other person, therefore it is a form of violence.
With violence there is usually counter violence.
Another level: forgiveness means you should try not to develop feelings of anger. Anger does not solve any problem. Anger only brings uncomfortable feelings on yourself. It destroys your own peace of mind.

(Dalai Lama)