Psalms 51:3

3.For If know my sins (259) He now discovers his reason for imploring pardon with so much vehemency, and this was the painful disquietude which his sins caused him, and which could only be relieved by his obtaining reconciliation with God. This proves that his prayer did not proceed from dissimulation, as many will be found commending the grace of God in high terms, although, in reality, they care little about it, having never felt the bitterness of being exposed to his displeasure. David, on the contrary, declares that he is subjected by his sin to constant anguish of mind, and that it is this which imparts such an earnestness to his supplications. From his example we may learn who they are that can alone be said to seek reconciliation with God in a proper manner. They are such as have had their consciences wounded with a sense of sin, and who can find no rest until they have obtained assurance of his mercy. We will never seriously apply to God for pardon, until we have obtained such a view of our sins as inspires us with fear. The more easily satisfied we are under our sins, the more do we provoke God to punish them with severity, and if we really desire absolution from his hand, we must do more than confess our guilt in words; we must institute a rigid and formidable scrutiny into the character of our transgressions. David does not simply say that he will confess his sins to man, but declares that he has a deep inward feeling of them, such a feeling of them as filled him with the keenest anguish. His was a very different spirit from that of the hypocrite, who displays a complete indifference upon this subject, or when it intrudes upon him, endeavors to bury the recollection of it. He speaks of his sins in the plural number. His transgression, although it sprung from one root, was complicated, including, besides adultery, treachery and cruelty; nor was it one man only whom he had betrayed, but the whole army which had been summoned to the field in defense of the Church of God. He accordingly recognises many particular sins as wrapt up in it.