The eye is the lamp of the body. You draw light into your body through your eyes, and light shines out to the world through your eyes. So if your eye is well and shows you what is true, then your whole body will be filled with light. But if your eye is clouded or evil, then your body will be filled with evil and dark clouds. And the darkness that takes over the body of a child of God who has gone astray—that is the deepest, darkest darkness there is. Matthew 6:22-24