Origen
Catena Aurea · Lukasevangelium 11
No man, when he hath lighted a candle, putteth it in a secret place, neither under a bushel, but on a candlestick, that they which come in may see the light. 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.
That is, If thy material body, when the light of a candle shines upon it, is made full of light, so that not one of thy members is any longer in darkness; much more when thou sinnest not, shall thy whole spiritual body be so full of light, that its brightness may be compared to the shining of a candle, while the light which was in the body, and which used to be darkness, is directed whithersoever the understanding may command.