Luke 11:34-36

34 The lamp of your body is the eye. When you have a `good eye,' [that is, when you are generous,] your whole body is full of light; but when you have an `evil eye,' [when you are stingy,] your body is full of darkness.

35 So take care that the light in you is not darkness!

36 If, then, your whole body is filled with light, with no part dark, it will be wholly lighted, as when a brightly lit lamp shines on you."