There are many tools for doing that and forgiveness is a good place to start. For the duration of this article, let's not perceive forgiveness as something just religious or spiritual. Look at it in a business sense - smart business. These energies produce hormones that toxify your mental, emotional and physical system. Forgiveness is just a process of re-balancing your internal energy distortions to recreate a harmonious flow between yourself and others.
People think they have forgiven others and realize later that they resent even more.
It doesn't mean that you are bad when this happens, it's just a matter of learning more about your system and, especially, the difference between the heart and the head. Completion is seriously important because if you leave a crack in the door, negative thoughts and emotions can blow it off the hinges. Heart intelligence clearly helps you to understand that forgiveness and release are especially for your own mental and emotional maintenance. People will do something for themselves more quickly if they can get the clarity of the benefits. I'm not implying that forgiveness doesn't benefit the other person, because the release that it causes in other people is obvious.