Luke 11:33

No one, when he has lit a lamp, puts it in a secret place or under a basket, but on a lampstand, that those who come in may see the light.

Light lets us see what is hidden and chases away the darkness.  We are meant to be light on this earth and represent Jesus.  We show the world what good is and that Gods Word is real by our lives.   As an example of Jesus light to the world, they can see the goodness of God’s Word and that His promises are true.  No one can see in darkness, but the light exposes the path.