What does James 1:24 mean?
James began a simile in verse 23 which he will conclude in verse 25. A person who listens to the Word—the message of Jesus—and does not actually do what it says is like a person who looks at his own face in a mirror and immediately forgets what he looks like. It's an absurd idea to think that we would be unable to recognize ourselves after seeing our own faces in a mirror. It's also ridiculous to bother looking in a mirror in the first place, if we're only going to ignore what we see.James' point is that it should be equally absurd to think that a Christian could hear the Word of God and fail to do what it says. That just doesn't make any sense. Those who believe the Word of God demonstrate their trust in God by obeying Him. Those who don't obey prove that they don't really trust Him.