Who is he that condemneth? It is Christ that died… – Romans 8:34

It is an ugly knock that a man’s heart gives when it smites him. There is no getting away from yourself, and when you yourself condemn yourself, then you are condemned indeed. You go to your bed, but your conscience is there, and it will not sleep. You go out to your pleasures, but your conscience goes with you, and spoils your mirth. You would forget your guilt in your daily business, but your conscience calls out at such a rate that there is no hearing anything else.

What is to be done when a man condemns himself? Can he still be valiant, and maintain his ground, calling out, “Who is he that condemneth?” Yes, blessed be God, even this foe can be overcome by the weapon the believer wields in the power of God, for he can tell conscience, “It is Christ that died.” It is a wonderful story-this old, old story, of Jesus and His love to guilty sinners; let me tell it once again. God so loved me that He willed to forgive me; but for the sake of the world which He governs righteously He could not forgive me without an atonement for my sin. It would not have been consistent with His justice for Him to pass by my sin. What was to be done? His own dear Son came, and stood in my place, and took my sin upon Him. Knowing that my sin deserved death, He willingly died, the Just for the unjust, that He might bring me to God. God is well pleased with the death of Christ as the vindication of His justice, and for Christ’s sake He says to me, “I have blotted out as a thick cloud thy transgressions, and as a cloud thy sins: return unto Me; for I have redeemed thee.” Tell conscience that Christ has died for your sins, according to the Scriptures, and it will be perfectly satisfied: it will not go to sleep, but it will use its voice for other purposes, and it will no longer seek to condemn you. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2240.cfm