Luke 11:33-36 - Light And Darkness
33 No one, when he has lighted a lamp, puts it in a secret place, or under a grain-measure, but on a lampstand, so that they who come in may see the light. 34 The light of the body is the eye. Therefore when your eye is sound, your whole body also is full of light. But when your eye is evil, your body also is full of darkness. 35 Therefore take heed that the light in you is not darkness. 36 Therefore if your whole body is full of light, having no part dark, the whole shall be full of light, as when the shining of a lamp enlightens you.