"A Prayer for Spiritual Cleansing"

PSALMS 51: [To the chief Musician, A Psalm of David, when Nathan the Prophet came unto him, after he had gone in to Bathsheba.]
I guess you know by now the title above this Psalm in my Bible; and by the introduction you can see that this was one of the lowest points in David's life; so it stands to reason, David needed "Spiritual Cleansing" more than anything else in his darkest hour. If you know the moment he is talking about, it was when Nathan came to him and gave him the story of a man that had many sheep, yet he took the little lamb of his neighbor, his only little lamb that he treated like his child, and he cooked it and fed it to his house guest (2 Samuel 12:1-14). This God gave Nathan to say as an illustration of the coldness of his heart, for he had committed adultery with Bathsheba, gotten her pregnant, and had her husband killed to try and cover it up. Her husband was a man named Uriah, who was listed as one of David's 'Mighty Men' (2 Samuel 23:39), and was more faithful to David than most men would ever be; which was got him killed, because he refused to go to his wife while he was in town, but instead stood guard at the door of the king's house (2 Samuel 11:6-15). David's heart was not always like that, but rather he was referred to by God as "a man after mine own heart", to which David was to fulfill God's perfect will (Acts 13:22). This has always given me wonder, not that David sinned, because we all sin, but rather the fact that David was a vessel used to "fulfill all" of God's will; as if David's sin committed was always meant to happen, and through it God's will was fulfilled in David's life and in the testimony of God's great mercy and grace. There where seven things that were included in David's repentance after Nathan had come to him: first off, he had a godly sorrow for his sin; secondly, he had verbal confession for what he had done; thirdly, he had a turning away from his sin, or a renouncing of it by changing his heart; fourthly, he experienced forgiveness; fifth, he had restoration to God's favor; sixth, he had rejoicing take place in his heart over his salvation; and seventh, he had a willingness to testify to others the grace of God. When God speaks of "the sure mercies of David" in Isaiah 55:3, He is speaking of this! God is showing us that no matter how much we blow it, or how bad our sin might be, that He is still able and willing to forgive us of our sin, to restore us, and to use us to do His will; which is His will being fulfilled...
"And He came to Nazareth, where He had been brought up; and as His custom was, He went into the synagogue on the sabbath day, and stood up for to read. And there was delivered unto Him the book of the prophet Isaiah. And when He had opened the book, He found the place where it was written, "The Spirit of the Lord is upon me, because He hath anointed me to preach the gospel to the poor; he hath sent me to heal the broken-hearted, to preach deliverance to the captive, and recovering of sight to the blind, to set at liberty them that are bruised, to preach the acceptable year of the Lord." And He closed the book, and He gave it again to the minister, and sat down. And the eyes of all them that were in the synagogue were fastened on Him. And He began to say unto them, "This day is this Scripture fulfilled in your ears." (Luke 4:16-21)