Luke 11:34-36 (New International Version)

³⁴Your eye is the lamp of your body. When your eyes are good, your whole body also is full of light. But when they are bad, your body also is full of darkness. ³⁵See to it, then, that the light within you is not darkness. ³⁶Therefore, if your whole body is full of light, and no part of it dark, it will be completely lighted, as when the light of a lamp shines on you."