The lamp of the body is the eye: therefore when your eye is sound, your whole body also is full of light; but when your eye is evil, your body also is full of darkness.
All Commentaries on Luke 11:34 Go To Luke 11
George Leo Haydock
AD 1849
If thy eye be single. As when the eyes of the body are pure, and free from the mixture of bad humours, the whole body is lightsome; so if the eyes of the mind, viz. reason, faith and understanding, are not infected with the pestiferous humours of envy, avarice, and other vices, the whole mind will be illuminated by the presence of the Holy Spirit. Take care, therefore, lest by giving way to these vices, the light which is in thee be turned into darkness. (Bar radius)