You can tell God all your horrible feelings of revenge and retaliation. Be honest about that. Christians sometimes feel they have to “nice-up” their prayers, but if you read Psalms or any of the prophets, you’ll see they are just as crazy as you and me. Let God handle the ugly force of your anger. Each day just wrestle with it, between you and Him, each night put it back on the shelf, and the volume of your hurt will decrease. It’s slow, but honesty is the start to healing. Don’t hide it — God is there to hear your venting.
— from this post