Luke 11:33-36:

You don’t light a lamp only to hide it in the cellar or to put it under a bucket. You put it on a stand where people see it when they come in. The lamp of your body is your eye. If your eye is sound, the whole body is filled with light. But if your eye is diseased, your body is filled with darkness. See to it then that the light in you doesn’t fade into darkness. If your whole body is full of light, however, with no darkness in it, it will be completely lit—the way it is when the light of a lantern shines on you.