The light of the body is the eye: if therefore your eye be sound, your whole body shall be full of light.
All Commentaries on Matthew 6:22 Go To Matthew 6
John Chrysostom
AD 407
However, forasmuch as this was too high for the mind of His hearers, and neither was the mischief within easy view of the generality, nor the gain evident, but there was need of a spirit of more self-command to perceive either of these; first, He has put it after those other topics, which are obvious, saying, Where the man's treasure is, there is his heart also; and next He makes it clear again, by withdrawing His discourse from the intellectual to the sensible, and saying,
The light of the body is the eye.
What He says is like this: Bury not gold in the earth, nor do any other such thing, for thou dost but gather it for the moth, and the rust, and the thieves. And even if you should entirely escape these evils, yet the enslaving of your heart, the nailing it to all that is below, you will not escape: For wheresoever your treasure may be, there is your heart also. As then, laying up stores in heaven, you will reap not this fruit only, the attainment of the rewards for these things, but from this world you already receive your recompence, in getting into harbor there, in setting your affections on the things that are there, and caring for what is there (for where you have laid up your treasures, it is most clear you transfer your mind also); so if you do this upon earth, you will experience the contrary.