Forgiveness is where a lot of men get stuck, especially with a father, a friend, or themselves. Scripture ties the forgiveness you extend to the forgiveness you have received, and it treats holding on to bitterness as the more expensive option.
Colossians 3:13
Forgive as the Lord forgave you—the measure is what you have already received.
COL.3.13
13 Bear with each other and forgive one another if any of you has a grievance against someone. Forgive as the Lord forgave you.
Jesus links the two directions of forgiveness in a way that is hard to read around.
MAT.6.14-15
14 For if you forgive other people when they sin against you, your heavenly Father will also forgive you.15 But if you do not forgive others their sins, your Father will not forgive your sins.
Bitterness and rage are things you put down; kindness is what you pick up instead.
EPH.4.31-32
31 Get rid of all bitterness, rage and anger, brawling and slander, along with every form of malice. 32 Be kind and compassionate to one another, forgiving each other, just as in Christ God forgave you.