But if your eye is bad, your whole body will be full of darkness. If therefore the light that is in you is darkness, how great is that darkness!
Matthew 6:23
Surrounding context
6:22 "The lamp of the body is the eye. If therefore your eye is good, your whole body will be full of light.
6:23 But if your eye is bad, your whole body will be full of darkness. If therefore the light that is in you is darkness, how great is that darkness!
6:24 "No one can serve two masters; for either he will hate the one and love the other, or else he will be loyal to the one and despise the other. You cannot serve God and mammon.