Light is needed for us to see.  This is just how God has created our eyes.  When light does not come into our eyes or our eyes cannot translate that light for our brain to understand, we are blind.  The same is true spiritually.  Our spiritual eyes needs to see the light of Jesus and be interpreted by him for our minds to be open to the things of God.  This message is about a blind man who can see, and seeing men who are blind.