In whom we have redemption through His blood, the forgiveness of sins… – Ephesians 1:7

I believe that the great joy of forgiveness, to the believer, is that God has taken away His anger from him. That sweet hymn, which we often sing, is a paraphrase of a passage in Isaiah-

“I will praise Thee every day,
Now Thine anger’s turned away;
Comfortable thoughts arise
From the bleeding Sacrifice.”

A person has grieved and wronged me. I feel hurt in my mind about it. When I forgive him, I no longer feel grieved or angry with him: I think of him as aforetime, and we are on good terms. If my forgiveness is genuine-and in God’s case it is emphatically so-then there is no resentment left. The offense is as though it had never been committed. I say to the person who did me wrong, “I take a sponge, and I wipe it all off the slate: give me your hand, let us stand as we stood before.” The pardon of sin by God is after such a fashion. He blots out the sin as the Oriental erases with his pencil the record made upon his waxen tablet, so that no trace of it remains. He smiles where else He must have frowned; He gives complacent love where else there must have been indignation and wrath. Do you not think that this is the sweetest way of looking at the forgiveness of sin? In the case of the poor penitent prodigal, it was the kiss of his father’s lip; it was his restoration to his father’s heart; it was the cheering words of his father’s love that constituted to him the sweetest fragrance of the rose of forgiveness. Yes, the Lord Jesus Christ has come, that we poor guilty ones may be restored to the favor of God, and walk consciously in the light of His countenance, because sin is removed. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2207.cfm