And not only so, but we also joy in God through our Lord Jesus Christ, by whom we have now received the atonement. – Romans 5:11

One of the chief securities for the holiness of the pardoned is found in the way of cleansing through atonement. The blood of Jesus sanctifies as well as pardons. The sinner learns that his free pardon cost the life of his best Friend; that in order to his salvation the Son of God Himself agonized even to a bloody sweat and died forsaken of His God. This causes a sacred mourning for sin, as he looks upon the Lord whom he pierced. Love to Jesus burns within the pardoned sinner’s breast, for the Lord is his Redeemer; and therefore, he feels a burning indignation against the murderous evil of sin. To him all manner of evil is detestable, since it is stained with the Saviour’s heart’s blood. As the penitent sinner hears the cry of, “Eloi, sabachthani!” he is horrified to think that one so pure and good should be forsaken of heaven because of the sin which He bore in His people’s stead. From the death of Jesus, the mind draws the conclusion that sin is exceedingly sinful in the sight of the Lord; for if eternal justice would not spare even the Well-beloved Jesus when imputed sin was upon Him, how much less will it spare guilty men? It must be a thing unutterably full of poison which could make even the immaculate Jesus suffer so terribly. Nothing can be imagined which can have greater power over gracious minds than the vision of a crucified Saviour denouncing sin by all His wounds, and by every falling drop of blood. What! live in the sin which slew Jesus? Find pleasure in that which wrought His death? Trifle with that which laid His glory in the dust? Impossible! Thus, you see that the gifts of free grace, when handed down by a pierced hand, are never likely to suggest self-indulgence in sin, but the very reverse. C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1735.cfm