What does Psalm 37:40 mean?

As he closes out this psalm, David emphasizes once again that the Lord provides for those who follow Him. He saves them from evil because of their faith. David, himself, knew that this did not mean God guaranteed bliss or safety for His people, always (Psalm 3:1–2; 34:19; John 16:33). Salvation from God is primarily eternal (John 3:16–18), and that is the main focus of His people (Hebrews 11:13–16).The psalm began with an appeal to reject anxiety on account of evil people (Psalm 37:1). It ends with a celebration of how God can save those who trust in Him.

When a tempestuous wind threatened to sink the ship that was transporting Paul to Rome to stand trial, the sailors feared for their lives, but an angel of God assured Paul there would be no loss of life though the ship would be lost. Paul addressed the hopeless crew and said, "Take heart, men, for I have faith in God that it will be exactly as I have been told" (Acts 27:25). Hebrews 11 is replete with accounts of how men and women overcame impossible situations and intense persecution by faith.