Luke 11:33-36

33“No one lighting a lamp puts it in a cellar or under a basket, but on the lampstand so that those entering may 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 sick, your body is full of darkness.

35Therefore, watch out that the light in you is not darkness.

36If then your body is full of light, with no part of it dark, it will be as full of light as when a lamp gives you light with its gleam.”