“Wash me, and I shall be whiter than snow.”- Psalm 51:7

Look at your sins and meditate upon them until they even drive you to despair. “What!” says one, “until they drive me to despair?” Yes; I do not mean that despair which arises from unbelief, but that self-despair which is so near akin to confidence in Christ. The more God enables you to see your emptiness, the more eager will you be to avail yourself of Christ’s fulness. I have always found that, as my trust in self went up, my trust in Christ went down; and as my trust in self went down, my trust in Christ went up, so I urge you to take an honest view of your own blackness of heart and life, for that will cause you to pray with David, “Wash me, and I shall be whiter than snow.” Weigh yourselves in the scales of the sanctuary, for they never err in the slightest degree. You need not exaggerate a single item of your guilt, for just as you are you will find far too much sin within you if the Holy Spirit will enable you to see yourselves as you really are.

When the sinner cries, “Wash me,” there must be some fount of cleansing where he can be washed “whiter than snow.” So there is, but there is nothing but the crimson blood of Jesus that can wash out the crimson stain of sin. What is there about Jesus Christ that makes Him able to save all who come unto God by Him? This is a matter upon which Christians ought to meditate much and often. Try to understand, dear friends, the greatness of the atonement. Live much under the shadow of the cross. Learn to-

“View the flowing
Of the Saviour’s precious blood,
By divine assurance knowing
He has made your peace with God.”

~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3278.cfm