Thematic Bible: What is the eye

The lamp of the body is the eye. When your eyesight is good, your whole body also is lighted up; but when it is defective, your body is darkened. Consider therefore whether the light that is in you is anything but mere darkness. If, however, your whole body is penetrated with light, and has no part dark, it will be so lighted, all of it, as when the lamp with its bright shining gives you light."