No man, when he has lighted a lamp, puts it in a secret place, neither under a bushel, but on a lampstand, that they who come in may see the light.
All Commentaries on Luke 11:33 Go To Luke 11
Theophilus of Antioch
AD 184
Or else, because the Jews, seeing the miracles, accused them out of the malice of their heart, therefore our Lord tells them, that, receiving the light, that is, their understanding, from God, they were so darkened with envy, as not to recognize His miracles and mercies. But to this end received we our understanding from God, that we should place it upon a candlestick, that others also who are entering in may see the light. The wise man indeed has already entered, but the learner is still walking. As if He said to the Pharisees, You ought to use your understanding to know the miracles and declare them to others, seeing that what you see are the works not of Beelzebub, but the Son of God. Therefore keeping up the meaning, He adds, The light of the body is the eye.
But as if the eye of the body be light the body will be light, but if dark the body will be dark also, so is it with the understanding in relation to the soul. Hence it follows, If your eye be single, your whole body will be full of light; but if evil, your whole body will befull of darkness.