Entering a dark room can be an uncomfortable experience. You don’t know where the furniture is and the danger of hitting a knee or a toe on the corner of a bed or dresser is a real problem. So what do you do to alleviate this situation? You turn on the light. Light exposes all things that are hidden by darkness. You no longer have to fear the bumps in the night when you can see clearly. This is the point that Paul makes to God’s people in this passage.