Ephesians 4:32 And be kind to one another, tenderhearted, forgiving each other, just as God in Christ also has forgiven you.
One of the most powerful weapons of the enemy against mankind is unforgiveness. We live with unhealed wounds as a result of unforgiveness. It produces fruits of bitterness, anger, and rage and can even lead to murder if left unchecked and not dealt with. It is also an easy way for us to allow the enemy to build strongholds.