Do not merely listen to the word, and so deceive yourselves. Do what it says. Anyone who listens to the word but does not do what it says is like a man who looks at his face in a mirror and, after looking at himself, goes away and immediately forgets what he looks like. But the man who looks intently into the perfect law that gives freedom, and continues to do this, not forgetting what he has heard, but doing it–he will be blessed in all he does. – James 1:22-25
If you believe something and it does not change who you are and what you do, it is worthless. Change me, God. I forget too easily.