Thematic Bible: What is the eye

Your eye is the lamp of your body; when your eye ( your conscience) is sound and fulfilling its office, your whole body is full of light; but when it is not sound and is not fulfilling its office, your body is full of darkness. Be careful, therefore, that the light that is in you is not darkness. If then your entire body is illuminated, having no part dark, it will be wholly bright [with light], as when a lamp with its bright rays gives you light.