This is easier said than done though. If we have been truly wronged by someone ... perhaps it was emotionally or physically or in a business deal or, heaven forbid, through some church activity (imagine that, will ya?)... how do we work beyond our hurt?
I think it only comes when we realize where our freedom comes from. When we realize the sacrifice made for sinners such as we and our calling to make that same sacrifice of forgiveness and even of laying our lives down for others in order that we, too, may enjoy resurrection life.
I believe it starts with prayer. Praying for our own heart through the pain and disappointment ... and also praying for the other individual.