And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ’s sake hath forgiven you. – Ephesians 4:32

“For Christ’s sake;” all the good things which God has bestowed upon us have come to us “for Christ’s sake,” but especially the forgiveness of our sins has come “for Christ’s sake.”…The great God can, as a just Lawgiver and King, readily pass by our offences because of the expiation for sin which Christ has offered. If sin were merely a personal affront toward God, we have abundant evidence that He would be ready enough to pass it by without exacting vengeance; but it is a great deal more than that. It would probably be the worst calamity that could happen-that any sin should go unpunished by the supreme Judge. Sometimes in a state, unless the lawgiver executes the law against the murderer, life will be in peril, and everything will become insecure, and therefore it becomes mercy to write the death-warrant: so is it with God in reference to this world of sinners…It is His very love as well as His holiness and His justice which, if I may use such a term, compels Him to severity of judgment, so that sin cannot and must not be blotted out till atonement has been presented. There must first of all be a sacrifice for sin, which, mark you, the great Father, to show His love, Himself supplies, for it is His own Son who is given to die, and so the Father Himself supplies the ransom through His Son- that Son being also one with Himself by bonds of essential unity, mysterious but most intense. If God demands the penalty in justice, He Himself supplies it in love. Tis a wondrous mystery, this mystery of the way of salvation by an atoning sacrifice; but this much is clear, that now God for Christ’s sake hath forgiven us, because satisfaction has been made to the injured honour of the divine government, and justice is satisfied. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1448.cfm