There are two types of forgiveness. The first is forgiveness for the past that might be contributing to the way you view the world now. Many people who have been abused or neglected by their parents, picked on by other kids growing up, hurt by a love relationship gone bad, lost something or someone due to an accident or act of violence by another hold on to these hurts and allow them to shape their world view. They no longer trust and these types of hurt impact almost every relationship in their lives.
The second type of forgiveness is for things that may be happening in the present or very recently. Your spouse did something to upset you, you think of one of the people you work with doesn’t pull his or her own weight, your neighbor doesn’t keep his or her yard up the way everyone else does in the neighborhood. These types of hurts have huge impact upon how you view the other and how you interact with them. This is especially true with couples where old wounds pile upon one another until its hard for you to see the good in your partner because you haven’t forgiven him or her for all the “bad stuff” that he or she has done.
Forgiveness is important because when we hold on to pain, old grudges, bitterness and even hatred, many areas of our lives suffer. We are the ones who pay the price over and over. We may bring our anger and bitterness into every relationship and new experience. Our lives may be so wrapped up in the wrong that we can't enjoy the present.