Obedience.

22 But don’t just listen to God’s word. You must do what it says. Otherwise, you are only fooling yourselves. 23 For if you listen to the word and don’t obey, it is like glancing at your face in a mirror. 24 You see yourself, walk away, and forget what you look like. 25 But if you look carefully into the perfect law that sets you free, and if you do what it says and don’t forget what you heard, then God will bless you for doing it. (James 1:22-25)