When you sin, how quickly do you repent? David held on to one of his sins for over a year! And his words in Psalm 32 are that it ate him up. He was physically affected because of his sin. Finally he couldn't take it anymore, and stopped trying to cover up his own sin. He confessed it and found that when he did – the LORD covered his sin for him! So he tells us: "Don't do what I did! Repent IMMEDIATELY!"