…the law entered, that the offence might abound. _ Romans 5:20

When the law enters a man’s heart, it brings his sin out in very strong relief. He never saw his sin to be so black as he now sees it to be. A stick is crooked, but you do not notice how crooked it is until you place a straight rule by the side of it. You have a handkerchief, and it seems to be quite white; you could hardly wish it to be whiter; but you lay it down on the newly-fallen snow, and you wonder how you could ever have thought it to be white at all. So the pure and holy law of God, when our eyes are opened to see its purity, shows up our sin in its true blackness, and in that way it makes sin to abound; but this is for our good, for that sight of our sin awakens us to a sense of our true condition, leads us to repentance, drives us by faith to the precious blood of Jesus, and no longer permits us to rest in our self-righteousness.

A little while ago, I met with a brother who said to me, “You cannot too forcibly describe the anguish of a convicted conscience; for,” said he, “I remember when I reckoned how long it would be before I must, in the ordinary course of nature, be in hell. I said to myself, ‘Suppose I live to be eighty years of age, yet how short a time it will be before I must be enduring the infinite wrath of God.'” Yes, that is the effect that the law of the Lord often produces upon a man when it enters his heart. It brings a mirror before him, and says to him “Look in there, and see not only what you have done, but also what is the just consequence of your evil deeds.” A man no longer cavils at God’s justice when the law once gets inside his heart; it shuts his mouth except for groans and sighs, and he has plenty of them…Let us thank God if ever we have experienced the entrance of His law into our hearts: for, although it makes sin to abound, is makes grace much more abound. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3115.cfm