Once he has looked at himself and gone away, he has immediately forgotten what kind of person he was (James 1:24). Sometimes we lose our way, forget who we really are. In those times, God often inspires people around us to hold up a mirror and let us see who we've become.
Why do you call Me, 'Lord, Lord,' and do not do what I say? (Luke 6:46). What contrary evidence could you provide if accused of being a "fake Christian"?