Consider this: Un-forgiveness makes you harsh, corrupts your good manners, impairs your attitude and robs you of your peace, but forgiveness improves your attitude, allows you to retain your peace, and encourages you to be more Christlikeness.
Meditate on this: "Get rid of all bitterness, rage, anger, harsh words, and slander, as well as all types of evil behavior. Instead, be kind to each other, tenderhearted, forgiving one another, just as God through Christ has forgiven you"(Ephesians 4:31-32 (NLT).
"But above all things put on love, which is the bond of perfection. And let the peace of God rule in your hearts, to which also you were called in one body; and be thankful (Colossians 3:14-15 NKJV).