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

The forgiveness of sin is still a matter of grace, and of rich grace. “We have redemption through His blood, the forgiveness of sins, according to the riches of His grace.” I admit that the forgiveness of sins, on God’s part, is a matter of justice, now that the redemption by blood has been completed. The man believes; the man confesses his sin; and it is written, “If we confess our sins, He is faithful and just to forgive us our sins.” The sacrifice is so great that it justly puts away the sin, and it is righteously forgiven…Beloved, it is only by grace that we are justified; yet that this grace is exercised in a way of justice causes the grace to be not less, but even manifestly more gracious. The death of Christ, the redemption by blood, instead of veiling the grace of God, only manifests it. Oh, if it be so, that God, the Divine Ruler, the Judge of all the earth, says to guilty man, “I will pardon you, but it is imperative that My law be carried out; and this cannot be done except by the death of My dear Son, who is one with Me, who is very God of very God, who Himself wills to stand in your stead, and vindicate My justice, by suffering the penalty due to you”-then I say that the grace of God is a thousand-fold more clearly shown than by the free forgiveness which “modern thought” pleads for! Pardon which has cost God more than it cost Him to make all worlds-which has cost Him more than to manage all the empires of His providence-which has cost Him His only-begotten Son and has cost that only-begotten Son a life of sorrow and a death of unutterable and immeasurable anguish-I say that this pardon is pre-eminently gracious. ~ C.H. Spurgeon

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