“David knew sin because he had touched the unclean thing and sounded the depths of iniquity. He knew himself because he had gone his own way and had learned through what thickets and morasses that pathway led, and what was its end. And he knew God, because he had tasted and seen that the Lord is gracious.”

Here’s a great snippet of a great sermon by B. B. Warfield on Psalm 51:

Thus we perceive that in its conception of God, of sin, of salvation alike, this Psalm stands out as attaining the high-water mark of Old Testament revelation. It was by a hard pathway that David came to know God and himself so intimately. But he came thus to know both his own heart and the God of grace with a fullness and profundity of apprehension that it will be hard to parallel elsewhere. And it was no merely external knowledge that he acquired thus. It was the knowledge of experience. David knew sin because he had touched the unclean thing and sounded the depths of iniquity. He knew himself because he had gone his own way and had learned through what thickets and morasses that pathway led, and what was its end. And he knew God, because he had tasted and seen that the Lord is gracious.

Yes, David had tasted and seen God’s preciousness. David had experience of salvation. He knew what salvation was, and He knew its joy. But never had he known the joy of salvation as he knew it after he had lost it. And it is just here that the special poignancy of David’s repentance comes in: it was not the repentance of a sinner merely, it was the repentance of a sinning saint.

It is only the saint who knows what sin is; for only the saint knows it in contrast with salvation, experienced and understood. And it is only the sinning saint who knows what salvation is: for it is only the joy that is lost and then found again that is fully understood.

Rev. Shane Lems is a minister in the Orthodox Presbyterian Church and serves as pastor of Covenant Presbyterian Church in Hammond, Wis. This article is used with permission.