For if, when we were enemies, we were reconciled to God by the death of His Son, much more, being reconciled, we shall be saved by His life. And not only so, but we also joy in God through our Lord Jesus Christ, by whom we have now received the atonement. – Romans 5:10,11

If God had forgiven sinners without an atonement they might have thought little of transgression, but now that pardon comes to them through the bitter griefs of their Redeemer they cannot but see it to be an exceeding great evil. When we look to Jesus dying on the cross we end our dalliance with sin, and utterly abhor the cause of so great suffering to so dear a Saviour. Every wound of Jesus is an argument against sin. We never know the full evil of our iniquities till we see what it cost the Redeemer to put them away. I think it is also very evident from our text that when they are saved, the converted find no ground of boasting; for when their hearts are renewed and made to love God they cannot say, “See how good I am,” because they were not so by nature; they were ungodly, and, as such, Christ died for them. Whatever goodness there may be in them after conversion they ascribe it to the grace of God, since by nature they were alienated from God, and far removed from righteousness…If ungodly and impious men would take heart and run to the Saviour, and by Him become cured of impiety and ungodliness, would not that be a good thing? Jesus has come to make the ungodly godly, the impious pious, the wicked obedient, and the dishonest upright. He has not come to save them in their sins, but from their sins; and this is the best of news for those who are diseased with sin; this great gate is set so wide open that the very worst of men may enter, and you, dear hearer, may enter now. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1191.cfm