Matthew 6:22-24

The lamp of the body is the eye: if therefore thine eye is sincere, thy whole body shall be full of light. But if thine eye is evil, thy whole body shall be full of darkness. If, therefore, the light that is in thee is darkness, how great is that darkness! No one can serve two masters, for either he will hate the one and love the other or else he will hold to the one and despise the other. Ye cannot serve God and riches.