The light of the body is the eye: therefore when thine eye is single, thy whole body also is full of light; but when [thine eye] is evil, thy body also [is] full of darkness. Take heed therefore that the light which is in thee be not darkness. If thy whole body therefore [be] full of light, having no part dark, the whole shall be full of light, as when the bright shining of a candle doth give thee light.