And Jesus answering saith unto them, Have faith in God. … 25And when ye stand praying, forgive, if ye have ought against any: that your Father also which is in heaven may forgive you your trespasses. 26But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses.  Mark 11:24-26
Then came Peter to him, and said, Lord, how oft shall my brother sin against me, and I forgive him? till seven times? 22Jesus saith unto him, I say not unto thee, Until seven times: but, Until seventy times seven. 23Therefore is the kingdom of heaven likened unto a certain king, which would take account of his servants. 24And when he had begun to reckon, one was brought unto him, which owed him ten thousand talents. 25But forasmuch as he had not to pay, his lord commanded him to be sold, and his wife, and children, and all that he had, and payment to be made. 26The servant therefore fell down, and worshipped him, saying, Lord, have patience with me, and I will pay thee all. 27Then the lord of that servant was moved with compassion, and loosed him, and forgave him the debt. 28But the same servant went out, and found one of his fellowservants, which owed him an hundred pence: and he laid hands on him, and took him by the throat, saying, Pay me that thou owest. 29And his fellowservant fell down at his feet, and besought him, saying, Have patience with me, and I will pay thee all. 30And he would not: but went and cast him into prison, till he should pay the debt. 31So when his fellowservants saw what was done, they were very sorry, and came and told unto their lord all that was done. 32Then his lord, after that he had called him, said unto him, O thou wicked servant, I forgave thee all that debt, because thou desiredst me: 33Shouldest not thou also have had compassion on thy fellowservant, even as I had pity on thee? 34And his lord was wroth, and delivered him to the tormentors, till he should pay all that was due unto him. 35So likewise shall my heavenly Father do also unto you, if ye from your hearts forgive not every one his brother their trespasses.  Mathew 18:21-35
Let love be without dissimulation. Abhor that which is evil; cleave to that which is good. 10Be kindly affectioned one to another with brotherly love; in honour preferring one another; 11Not slothful in business; fervent in spirit; serving the Lord; 12Rejoicing in hope; patient in tribulation; continuing instant in prayer; 13Distributing to the necessity of saints; given to hospitality. 14Bless them which persecute you: bless, and curse not. 15Rejoice with them that do rejoice, and weep with them that weep. 16Be of the same mind one toward another. Mind not high things, but condescend to men of low estate. Be not wise in your own conceits. 17Recompense to no man evil for evil. Provide things honest in the sight of all men. 18If it be possible, as much as lieth in you, live peaceably with all men. 19Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord. 20Therefore if thine enemy hunger, feed him; if he thirst, give him drink: for in so doing thou shalt heap coals of fire on his head. 21Be not overcome of evil, but overcome evil with good.  Romans 12:9-21
Rejoice not when thine enemy falleth, and let not thine heart be glad when he stumbleth: 18Lest the LORD see it, and it displease him, and he turn away his wrath from him.  Proverbs 24:17-18
Follow peace with all men, and holiness, without which no man shall see the Lord: 15Looking diligently lest any man fail of the grace of God; lest any root of bitterness springing up trouble you, and thereby many be defiled;  Hebrews 12:14-15
Do we have faith in God? … that he will correct/punish the wrong doer and reward the innocent fairly … in the most appropriate way … if we have to see it happen in a way that we connect the punishment/reward with the incident, then it is not faith. Faith believes what God says with or without comprehension …as a young child trusts its parents … we are His children if we do the same.
Not forgiving, produces bitter thoughts every time we remember, causing torment. Not learning to forgive allows the devil through even more persons/circumstances to cause more/greater problems until we learn the forgiveness lesson. Or, being in hell, contemplating our eternal situation because of not forgiving will produce everlasting torment … especially, if some of our wrong doers made it to heaven because they then or later finally learnt their lessons, humbly sought forgiveness and changed their ways … but we are in hell because of not forgiving. Forgiving does not stop bad things from happening but reduces the frequency and minimizes the effects/stress. Also, in time the persons who wronged us are too busy living life to even remember wronging us yet our self-torment eventually incurs more damage to us than the initial wrong doing. Events/circumstances obviously have no sense of right or wrong and no memory so what intelligence is their in being bitter over an event?
Our lifelong total sins/debt; in actions and ‘thoughts’ contrary to the will of God, far overshadows any wrong doing to us. Our mind is an amphitheatre before God … what has been playing?
Non-forgiveness incites bitter thoughts creating bad attitudes invoking negative emotions/decisions/actions perpetuating a toxic spiritual-emotional environment thereby (consciously or subconsciously) affecting others causing them to be defiled … the person who offended us or innocent bystanders … perpetuating the cycle of negativity.
When a person says, “I forgive but will not forget,” usually, they are lying with themselves being the only one deceived … God is not fooled.
On the other hand, it is erroneous to say, “You must forget to forgive” … God does not forget anything and he forgives but He and we can forgive as if we forget … with time we humans may forget.
In this life we do nothing perfectly good or evil. God is 100% good. Satan is totally evil. We are forgiven to the degree we forgive. Imperfection is not an excuse to fail but an incentive to try harder.
As a young Christian when I had a problem with someone and I went to God in prayer it very quickly became evident that the Lord did not even want to hear from me about the situation until I unconditionally forgave any possible wrong doing. Then before I was permitted to speak regarding anyone else I had to first play the film in my mind back slowly, especially the parts pertaining to “my” responses to see where I may have acted or ‘thought’ wrong … also, how I could have done better. Even if, I was only 5 % wrong and the other person or persons were 95 % wrong I still had to the deal with my 5 % and let God deal with their 95 %. I was to apologize to God and any others involved for my shortcomings even if they did not deal with their issues. When reflecting on the inadequacies of others I was to have compassion because I did not know what had happened in their lives to influence them to be the way they were. Therefore, I was to ask God to help them overcome those problems. Also, I was not to be concerned about the fact that they had offended me but more importantly they had offended God and were in jeopardy of judgment. Hence, I should be concerned for their present/eternal well being and prayerfully intercede on their behalf by asking God to forgive, help and bless them. It is hard to have negative thoughts toward others when we care and do these things. This is true love and selflessness.
If they need to be punished I shouldn’t desire to see it because that is sadistic. Even if they are going to go to hell, taking pleasure in that fact is evil … hell is forever. In a situation where I am the appointed disciplinarian, I am to act with remorse.
Turning the other cheek, doing good to and praying for our adversaries is going the extra mile in hopeful expectation that our intentions and actions will induce conviction, inspire repentance & conclude in forgiveness … for all; involved or observing.