The eye is the lamp of your body; when your eye is clear, your whole body is also full of light; but when it is bad, your body also is full of darkness.

     The eye is the lamp of your body; when your eye is clear, your whole body is also full of light; but when it is bad, your body also is full of darkness. Then watch out that the light in you is not darkness. If therefore your whole body is full of light, with no dark part in it, it will be wholly illuminated, as when the lamp illuminates you with its rays. 

HOLY BIBLE Luke 11:34-36