Forgive, or you will not be forgiven

Scripture references

Matthew 6:14–15 (ASV 1901)

14For if ye forgive men their trespasses, your heavenly Father will also forgive you. 15But if ye forgive not men their trespasses, neither will your Father forgive your trespasses.

Luke 6:37 (ASV 1901)

37And judge not, and ye shall not be judged: and condemn not, and ye shall not be condemned: release, and ye shall be released:

Stories

While visiting a farm, Corrie Ten Boom spoke to the father about forgiving his son using the scripture taught to "forgive us our debts as we forgive our debtors". That night, father and son were reconciled!
A Chinese evangelist whose entire family was killed by the Boxers was unable to find peace, nor was he able to pray, until he forgave his enemies; whom he was previously planning to murder. God showed him plainly that if he would not forgive his enemies, God could not forgive him.
An evangelist confessed his bitterness and struggle to avenge the killing of his family. The understanding that Christ forgives us as we forgive us our sins as we forgive those who offend us brought him to the place of prayer.
After attending a meeting where Jonathan Goforth taught on forgiveness, Yeh was convicted to become a Christian and consequently decided to forgive the Cheng's; a family with whom he was embroiled in a lawsuit. In just 3 months, Yeh would eventually lead every member of the Chang family by his forgiveness and attitudinal change towards them.
Russell Stendal found precious internal freedom and lasting psychological welfare as he forgave his captors through the power of Christ.
Corrie ten Boom helps a man overcome bitterness and unforgiveness by sharing her own, similar experience, and how Jesus delivered her.
Tom Hamblin is convicted of his unforgiveness, there and then he forgives. As a result, he experienced an instant special anointing in his preaching and teaching.