And his disciples asked him, "Rabbi, who sinned, this man or his parents, that he was born blind?" Jesus answered, "It was not that this man sinned, or his parents, but that the works of God might be made manifest in him. We must work the works of him who sent me, while it is day; night comes, when no one can work. As long as I am in the world, I am the light of the world." As he said this, he spat on the ground and made clay of the spittle and anointed the man's eyes with the clay, saying to him, "Go, wash in the pool of Silo'am" (which means Sent). So he went and washed and came back seeing. ( John 9:2-7)