For if you forgive men for their sins, your heavenly Father will also forgive you. But if you do not forgive men for their sins, neither will your Father forgive your sins. Matthew 6:14-15 MEV
Two of the strongest scriptures in the Bible, I believe, are those of Matthew 6:25-26. In them is the unalterable mandate of God to walk the love walk. They totally destroy any and every excuse to harbor unforgiveness for anything.
How can God be so stern? It is because He sent His Son, Jesus, to give His life for His enemies.
For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life. Romans 5:10 AV
Jesus gave His life for all even though some would reject His sacrificial act of love. He took our sin upon Himself so that we would not have to perish because of them. He is willing to forgive all who will come to Him through His Son, Jesus the Christ.
Romans 5:14-21 AV 14 Nevertheless death reigned from Adam to Moses, even over them that had not sinned after the similitude of Adam’s transgression, who is the figure of him that was to come. 15 But not as the offence, so also is the free gift. For if through the offence of one many be dead, much more the grace of God, and the gift by grace, which is by one man, Jesus Christ, hath abounded unto many. 16 And not as it was by one that sinned, so is the gift: for the judgment was by one to condemnation, but the free gift is of many offences unto justification. 17 For if by one man’s offence death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ.) 18 Therefore as by the offence of one judgment came upon all men to condemnation; even so by the righteousness of one the free gift came upon all men unto justification of life. 19 For as by one man’s disobedience many were made sinners, so by the obedience of one shall many be made righteous. 20 Moreover the law entered, that the offence might abound. But where sin abounded, grace did much more abound: 21 That as sin hath reigned unto death, even so might grace reign through righteousness unto eternal life by Jesus Christ our Lord. Romans 5:14-21 AV
To ignore such a gift is to spit in the face of God who is the only Righteous Judge.
Forgive or Perish.
The choice is yours.