Luke 11:33-36

33“No one after lighting a lamp puts it in a hidden place or under a basket, but on a lampstand, so that those who come in can see the light.

34Your eye is the lamp of your body. When your eye is healthy, your whole body is full of light, but when it is diseased, your body is full of darkness.

35Therefore see to it that the light in you is not darkness.

36If then your whole body is full of light, with no part in the dark, it will be as full of light as when the light of a lamp shines on you.”