Matthew 6:23
"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!"
Cross References (ranked by relevance)
The light of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light.
For my people is foolish, they have not known me; they are sottish children, and they have none understanding: they are wise to do evil, but to do good they have no knowledge.
Seest thou a man wise in his own conceit? there is more hope of a fool than of him.
Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart:
But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.
For ye were sometimes darkness, but now are ye light in the Lord: walk as children of light:
Professing themselves to be wise, they became fools,
And he said, Unto you it is given to know the mysteries of the kingdom of God: but to others in parables; that seeing they might not see, and hearing they might not understand.
To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.
Is it not lawful for me to do what I will with mine own? Is thine eye evil, because I am good?
Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness: