Psalms 51:14

Purge me with hyssop, with the blood of Christ applied to my soul by a lively faith, as the water of purification was sprinkled with a bunch of hyssop. The blood of Christ is called the blood of sprinkling, He 12:24. If this blood of Christ, which cleanses from all sin, cleanse us from our sin, then we shall be clean indeed, He 10:2. He asks not to be comforted, till he is first cleansed; if sin, the bitter root of sorrow, be taken away, he can pray in faith, Let me have a well-grounded peace, of thy creating, so that the bones broken by convictions may rejoice, may be comforted. Hide thy face from my sins; blot out all mine iniquities out of thy book; blot them out, as a cloud is blotted out and dispelled by the beams of the sun. And the believer desires renewal to holiness as much as the joy of salvation. David now saw, more than ever, what an unclean heart he had, and sadly laments it; but he sees it is not in his own power to amend it, and therefore begs God would create in him a clean heart. When the sinner feels this change is necessary, and reads the promise of God to that purpose, he begins to ask it. He knew he had by his sin grieved the Holy Spirit, and provoked him to withdraw. This he dreads more than anything. He prays that Divine comforts may be restored to him. When we give ourselves cause to doubt our interest in salvation, how can we expect the joy of it? This had made him weak; he prays, I am ready to fall, either into sin or into despair, therefore uphold me with thy Spirit. Thy Spirit is a free Spirit, a free Agent himself, working freely. And the more cheerful we are in our duty, the more constant we shall be to it. What is this but the liberty wherewith Christ makes his people free, which is contrasted with the yoke of bondage? Ga 5:1. It is the Spirit of adoption spoken to the heart. Those to whom God is the God of salvation, he will deliver from guilt; for the salvation he is the God of, is salvation from sin. We may therefore plead with him, Lord, thou art the God of my salvation, therefore deliver me from the dominion of sin. And when the lips are opened, what should they speak but the praises of God for his forgiving mercy?

Deliver me from bloodguiltiness. He had been the means of the death of Uriah, the Hittite, a faithful and attached follower, and he now confesses that fact. Besides, his sin of adultery was a capital offence, and he puts himself down as one worthy to die the death. Honest penitents do not fetch a compass and confess their sins in an elegant periphrasis, but they come to the point, call a spade a spade, and make a clean breast of all. What other course is rational in dealing with the Omniscient? O God, thou God of my salvation. He had not ventured to come so near before. It had been, O God, up till now, but here he cries, Thou God of my salvation. Faith grows by the exercise of prayer. He confesses sin more plainly in this verse than before, and yet he deals with God more confidently: growing upward and downward at the same time are perfectly consistent. None but the King can remit the death penalty, it is therefore a joy to faith that God is King, and that he is the author and finisher of our salvation. And my tongue shall sing aloud of thy righteousness. One would rather have expected him to say, I will sing of thy mercy; but David can see the divine way of justification, that righteousness of God which Paul afterwards spoke of by which the ungodly are justified, and he vows to sing, yea, and to sing lustily of that righteous way of mercy. After all, it is the righteousness of divine mercy which is its greatest wonder. Note how David would preach in the last verse, and now here he would sing. We can never do too much for the Lord to whom we owe more than all. If we could be preacher, precentor, doorkeeper, pew opener, foot washer, and all in one, all would be too little to show forth all our gratitude. A great sinner pardoned makes a great singer. Sin has a loud voice, and so should our thankfulness have. We shall not sing our own praises if we be saved, but our theme will be the Lord our righteousness, in whose merits we stand righteously accepted.