The Lamp of the Body

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

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

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

If then you 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.

Luke - Chap.11 - v. 33-36.inc. New King James Version