Expositor's Bible Commentary Commentary Luke 11:34

"The lamp of thy body is thine eye: when thine eye is single, thy whole body also is full of light; but when it is evil, thy body also is full of darkness." — Luke 11:34 (ASV)

Good eyes admit light, bad ones do not. Jesus implies that the individual is responsible for receiving light. The eye is thus a “lamp,” not in the sense that it emits light, but that through it the body receives light. The real source of light is outside the body; if we think we can generate our own light, we must beware lest that inner “light” prove to be darkness.