Matthew 6:14-15 For if you forgive others their trespasses, your heavenly Father will also forgive you, but if you do not forgive others their trespasses, neither will your Father forgive your trespasses. Yes it is very important to forgive and let it go. If not you carry that weight on your shoulder and when we give it to GOD HE WILL LIFT AWAY OUR BURDENS IN LIFE