For if ye forgive men their trespasses, your heavenly Father will also forgive you: 15 But if ye forgive not men their trespasses, neither will your Father forgive your trespasses.
Matthew 6:14-15
If I withhold forgiveness from someone, I create a barrier to my own forgiveness from God. If I choose to forgive and let God take it from there, healing and restoration comes to me. When I forgive you, it doesn’t change you, it changes me. It’s like dropping a stone in a still pond. It creates a ripple of grace, that gets bigger and bigger and gives God access to change you, too.