It is well known that King David was a prolific song writer. 2 Samuel 22:1-51 is one of his compositions, pretty much identical to what is recorded in Psalm 18. We can read David’s song as a testimony to the strong and abiding grace of God toward him, but also as a forerunner and pointer to the grace of His greater Son, Jesus, who would come and show grace to the extreme, not just to David but to all His people.