One of my favorite things ever is when the moon shines so brightly there's a moon-shadow. Now, I'm no astrologist or scientist or whatever you call someone who knows stuff like that, but I know that the moon can only function based on it's position in relation to the sun.
How much more true is that for us? If we are called to mimic the other Son, shouldn't our lives be postured in relation to best reflect the Son? So that our lives can glow brightly and cast Jesus-light into the depths of the night.