John 8:12 -- "When Jesus spoke again to the people, he said, "I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life."
Why do we need a light?
Because of the darkness around us.
We go walking occasionally after dark. Rick walks in front of me, shining a flashlight on the road. To care for me, to insure that I can see the way ahead, to help me avoid danger and injury.
Jesus is the Light of the world. He lives in us (Galatians 2:20). Therefore we are the Light to the world. A world of darkness and despair.
O Father God! Make my life pure today - so that Your Light can shine brightly in this world of darkness.