Mark 11:22-25 (New International Verson)

22 "Have faith in God," Jesus answered.
23 "I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him.
24 Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours.
25 And when you stand praying, if you hold anything against anyone, forgive him, so that your Father in heaven may forgive you your sins."

Christ tells us to forgive others! God wants to forgive us of our sins but, He cannot forgive us, if we do not forgive others. We will tie the hands of God, when we cannot forgive others. Non-forgiveness restricts God from blessing us.
Most of the time the person whom we cannot forgive doesn't even know that you have something against them. And some could care less if you do.
I've seen people who uses non-forgiveness as a way of control. To hold somebody in bondage.
I've also seen people who wants themselves to be forgiven by others but, they themselves cannot forgive. They will only forgive when something is in it for themselves. Or should I say that is an act. They go behind that person back & say nasty things about that person (that is gossip). That isn't forgiveness at all. That right there is selfishness.
To forgive is love, as Christ loved us that He gave His life, to cover our sins (that was the only way in which sin could be covered is by shedding of blood)!
Be quick to forgive, do not let things fester!
If you feel you cannot forgive; ask God to help. The Holy Spirit is there to help you. Don't let hate or non-forgiveness destroy you. Open us your heart to God. Go to that person & ask for forgiveness. This shows that you love Christ more then yourself, so don't do harm to others. Love them! Forgive them as Christ has forgiven you!!!

AMEN & AMEN
Rev. Londa