Thematic Bible: What is the eye

'The lamp of the body is the eye, when then thine eye may be simple, thy whole body also is lightened; and when it may be evil, thy body also is darkened; take heed, then, lest the light that is in thee be darkness; if then thy whole body is lightened, not having any part darkened, the whole shall be lightened, as when the lamp by the brightness may give thee light.'