John 9:1-5

And as he passed by, he saw a man blind from his birth. And his disciples asked him, saying, Rabbi, who sinned, this man, or his parents, that he should be born blind? Jesus answered, Neither did this man sin, nor his parents: but that the works of God should be made manifest in him. We must work the works of him that sent me, while it is day: the night cometh, when no man can work. When I am in the world, I am the light of the world.