When a person is truly deserving of revenge, there is nothing you need to do. The seeds of destruction are already within them. If they are hurting you, put yourself in a position where they cannot, or the chance of it is minimal. If you tolerate offense, you invite injury. Surround yourself with good people. Find ways to serve and uplift them. We will always cross paths with those who would willingly injure us. Minimize the opportunity of this, and when injured, let it go and move on. Revenge never works.