The main cause of unhappiness is that you didn’t get your own way. This emotion leads to both physical and continued, expanded emotional problems, bitterness, anger, revenge, even murder. But how to stop it?
If Jesus is knocking at the door of your heart (Rev 3:20), how can you open the door? The knob on your side is named “Forgiveness.”
Jesus’ basic prayer for all persons says, “forgive us our transgressions as we have (already) forgiven others. All that crucifixion, all that victory for the whole world starts at forgiveness, which is not God’s job but yours. Jesus did His job; now you do your part.
But I can’t do that, you protest! Yes you can, your future depends on your ability to release yourself from the bondage. It has nothing to do with your being justified in your position. You may be the victim who appears on a TV program; your story may be so awful no one listens or believes you. Never mind, God knows. And while you are seething with resentment and blame, the person you have not forgiven is living life without any (apparent) sense of loss.
What happens when you forgive? First, you are free. (By the way you may need to voice this forgiveness many times over.) But when you take your hands off the person(s) who hurt you, God is available now to judge and reach them.
Vengeance is mine, says God. (Deut 32:35) Good – now He can step in. And no, you don’t need to know how He is dealing with them. You will find out in due time. This is His promise. (Deuteronomy 32:35-Vengeance is Mine, and recompense; Their foot shall slip in due time; For the day of their calamity is at hand, And the things to come hasten upon them.)
“I choose to forgive (name them by name if you can)” and allow God to free you and to handle this situation. And He will.
Do not forget to forgive yourself and God too. Most people are blaming Him for something. People who pray this prayer often report immediate changes in their life. Try it. After all, it is your life and only you are in charge of your own life.