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.
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Cornelius a Lapide
AD 1637
The light of the body is the eye. Figuratively the eye represents reason, intellect, especially good intention—for what the eye is to the body, such is reason or good intention to the mind.
When thine eye is single, thy whole body also is full of light, i.e. illumined by a single, a clear and unclouded eye.
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)
