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; 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. Matthew 5:44-45 KJV https://bible.com/bible/1/mat.5.44-45.KJV
Lord God please help me to not hate.
The most stunning example of forgiveness I can think of, next to Jesus, is the example of St. Maria Goretti and her murderer. It's a model to think about. This priest narrates it very well. BTW this priest was an atheist, became a Catholic, then a priest, then an expert in holy relics, then an exorcist. So his life too is full of changes.
https://www.youtube.com/watch?v=FjuZJQdEcdg