Read Matthew 6:23 Using Other Translations
But if thine eye be evil, thy whole body shall be full of darkness. If therefore the light that is in thee be darkness, how great is that darkness!
but if your eye is bad, your whole body will be full of darkness. If then the light in you is darkness, how great is the darkness!
But when your eye is bad, your whole body is filled with darkness. And if the light you think you have is actually darkness, how deep that darkness is!