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Mark 11:25 And when ye stand praying, forgive, if ye have ought against any: that your Father also which is in heaven may forgive you your trespasses. 26 But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses.
Matthew 18:21 Then came Peter to him, and said, Lord, how oft shall my brother sin against me, and I forgive him? till seven times? 22 Jesus saith unto him, I say not unto thee, Until seven times: but, Until seventy times seven.
We forgive because we are commanded to forgive. We forgive in the same way that we want to be forgiven. We forgive in the way that God says he forgives us – by remembering the offence no more. Forgiveness is an act of love. If we truly love for Christ’s sake, we will forgive.
Isaiah 38:17 Behold, for peace I had great bitterness: but thou hast in love to my soul delivered it from the pit of corruption: for thou hast cast all my sins behind thy back.
Isaiah 43:25 I, even I, am he that blotteth out thy transgressions for mine own sake, and will not remember thy sins.
Jeremiah 31:34 And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more.
Ezekiel 18:22 All his transgressions that he hath committed, they shall not be mentioned unto him: in his righteousness that he hath done he shall live.
Hebrews 8:12 For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.
Hebrews 10:17 And their sins and iniquities will I remember no more. Psalms 103:12 As far as the east is from the west, so far hath he removed our transgressions from us.
We cannot literally forget offences against us. We have no switch to blank them from our mind. We have, by an act of will, to treat the offender as we would have treated them had they not committed the offence.
Matthew 5:44 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you; 45 That ye may be the children of your Father which is in heaven: for he maketh his sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust. 46 For if ye love them which love you, what reward have ye? do not even the publicans the same? 47 And if ye salute your brethren only, what do ye more than others? do not even the publicans so? 48 Be ye therefore perfect, even as your Father which is in heaven is perfect.
We have to love as God loved us.
Romans 5:8 But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.
If the offence is a severe injustice and the offender unrepentant, we are not to seek revenge but leave it in the hands of God..
Romans 12:19 Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord.
I hope this helps.