why we forgive

We forgive, then, out of self-interest. I forgive you because I want out of my pain. I forgive you so that I can be free of what you did. I see beyond your mistake to the love in you so that I can see beyond the mistake to the love in me—because only then can I have a miracle. The universe will immediately reprogram itself to send us miracles, when we remove the barriers to our willingness to love. Forgiveness is the most powerful key to new beginnings.
— Marianne Williamson - The Law of Divine Compensation