But if your eye be evil, your whole body shall be full of darkness. If therefore the light that is in you be darkness, how great is that darkness!
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John Chrysostom
AD 407
If your eyes were completely blind, would you choose to wear gold and silk? Wouldn’t you consider your sound health to be more desirable than mere externals? For if you should lose your health or waste it, all the rest of your life would be unhappily affected. For just as when the eyes are blinded, some of the ability of the other members is diminished, their light being quenched, so also when the mind is depraved, your life will be filled with countless evils. As therefore in the body it is our aim to keep the eye sound, so also it should be our aim to keep the mind sound in relation to the soul. But if we destroy this, which ought to give light to the rest, by what means are we to see clearly any more? For as he who destroys the spring may also dry up the river, so he who has quenched the understanding may have confounded all his actions in this life. So it is said, “If the light that is in you be darkness, how great is the darkness?” For when the pilot is drowned, when the candle is put out, when the general is taken prisoner, what sort of hope will remain for those that are under his command? The Gospel of Matthew, Homily