Psalm 25

In verse 11 David pleads for the pardon of his sins. A task that he recognizes is great because his sins (like mine) are very great in God's sight. But he begins the request with a recognition of God's promises. Since the fall of man God has been forgiving sin and promising to forgive more and more. It is because of these promises that David prays with confidence. God has made a promise and so to show honor to his name he will keep that promise. God will pour his heart and soul into flesh in order to fulfill his promise. David didn't fully understand HOW God would keep his promise. All he knew, by faith, was that God Would keep his promise.
It took me about 3 minutes to read this passage.
Stuart