Luke 11:33-36

33“No one, when he has lit a lamp, puts it in a secret place or under a basket, but on a lampstand, that those who come in may see the light.

34The lamp of the body is the eye. Therefore, when your eye is good, your whole body also is full of light. But when your eye is bad, your body also is full of darkness.

35Therefore take heed that the light which is in you is not darkness.

36If then your whole body is full of light, having no part dark, the whole body will be full of light, as when the bright shining of a lamp gives you light.”