Luke 11:33-36 - Light And Darkness
33 No one lights a lamp and puts it in a cellar or under a peck-measure, but he puts it on the lampstand, that the people who come in may enjoy the light. 34 Your eye is the very lamp of your body. When your eye is sound, your whole body is full of light. But if your eye is unsound, your body is full of darkness. 35 So be on your guard that the very source of light in you is not darkness. 36 If then your whole body is full of light with no part of it in darkness, it will all be as light for you as it is when a lamp makes it light for you by its shining."