To which extent that God wants us to forgive? Did the bible explain that? 77 times?
I may tell God that I forgive the murderer of my mother, but is my forgiveness sincere? I can speak out that I forgive, but in my heart I actually hate the murderer, then what's the point of forgiving him? Am I not a hypocrite?
Jesus said, forgive your brother up to 70 times 7 or 490 times.
Meaning: keep forgiving always.
Forgiveness must be complete, unconditional, sincere. Jesus said, love and bless your enemies, do good to those who do evil to you, who persecute you.
Forgiveness doesn't mean endorsing the perpetrator or their sinful act. It doesn't mean forgetting what happened, or pretending it never happened. It means, complete purging of your heart of anger and treating the sinner as somebody for whom Jesus has died also.
This is only possible if you look at your enemies with the eyes of Jesus. That is, with ultimate love and acceptance. When people were mocking, torturing, killing the Son of God, He said, Father, forgive them, for they know not what they are doing.
It is humanly impossible to show such forgiveness. But whatever is impossible to people, is possible to God. So, ask for His help. For strength and ability to forgive. It will come in time. Ask for His kind of love. Even to the worst of scum who did such awful thing to you or your loved one. They don't understand. They don't know. They don't see. They are in the worst of delusions and sin. They need forgiveness from God, most of all.
All people are in equal position before the Creator. We are all sinful and need forgiveness from Him. He provided the forgiveness to us through the shedding of the blood of Jesus Christ as sacrifice for all sin on the cross. It is the ultimate, and the most powerful source of all forgiveness.