For He hath made Him to be sin for us, who knew no sin; that we might be made the righteousness of God in Him. – 2 Corinthians 5:21

If sin had been blotted out so readily, and nothing more said of it, what effect would that have had on us in the future? I think that everyone who has felt the burden of sin, and has stood at the foot of the cross, and heard the cries of the great Sacrifice, and read God’s wrath against sin written in crimson lines upon the blessed and perfect person of the innocent Savior-every such person feels that sin is an awful thing. You cannot trifle with transgression after a vision of Gethesmane. You cannot laugh at it, and talk about the littleness of its demerit, if you have once stood on Golgotha, and heard the cry, “Eli, Eli, lama sabachthani?” The death of the Son of God upon the cross is the grandest of all moral lessons, because it is a lesson that affects the very soul of the man and changes his whole idea of sin. The cross straightens him from the desperate twist which sin gave him at the first. The cure of the first Adam’s fall is the second Adam’s death-the second Adam’s grace, which comes to us through His great sacrifice. We love sin till we see that it killed our best Friend, and then we loathe it evermore. I say, again, that if the great Father did forgive you, and said, “There is nothing in it; go your way, it is all over;” you would have lacked that grandest source of sanctified life which now you find in the wounds of Him who has made sin detestable to you, and has made perfect obedience, even unto death, the subject of you soul’s admiration. Now you long to be unto the great Father, in your measure, what your great Redeemer was to Him when He magnified the law and made it honorable. This is no mean benefit. ~ C.H. Spurgeon

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