Matthew 6:22-23
“The lamp of the body is the eye. If therefore your eye is sound, your whole body will be full of light. But if your eye is evil, your whole body will be full of darkness. If therefore the light that is in you is darkness, how great is the darkness!”
This passage is part of Jesus' Sermon on the Mount, found in the Gospel of Matthew. Jesus is teaching his followers about true righteousness, contrasting external piety with inner motives and spiritual understanding. These verses immediately follow his teaching on storing up treasures in heaven rather than on earth, and precede his teaching on serving one master (God) instead of two.
What does it mean for our inner understanding to be 'sound' or 'evil' in how we perceive the world around us?