" But as Newton grew more and more aware of his own sin and the evil that debased his best service, he was careful not to take his eyes off Christ. “I could go on complaining,” Newton wrote a friend, “but I check myself. I am vile indeed, but Jesus is full of grace and truth. He leads and guides, he feeds and guards, he restores and heals. He is an all-sufficient Savior.”66 Under the care of such an all-sufficient Christ, the chief of sinners does not despair, but presses on toward holiness. "

― Tony Reinke , Newton on the Christian Life: To Live Is Christ (Theologians on the Christian Life)