Forgiveness is a gift you give yourself. – Suzanne Somers
Forgiveness enables deep healing to occur inside you. It’s a healing that makes the mind sane and the body healthier. It’s a soothing salve that works wonders. At a spiritual level forgiveness allows for a smooth flow of energies in your body that might otherwise be hampered. Once you free that energy up, via forgiveness, you feel better in all respects!
Another way to achieve similar results is to use EFT: a form of affirmations and acupressure tapping. More info here and here.
Recommendation: The EFT Manual