Matthew 6:23

but if your eye is evil, your whole body will be dark. If, therefore, the light which is in you is darkness, how great is the darkness!

Luke 11:34-35

The light of the body is the eye; when, therefore, your eye is sound, your whole body is light; but when your eye is evil, your whole body is dark.

Ephesians 5:8

For you were formerly darkness, but now you are light in the Lord. Walk as children of light,??9 for the fruit of the light is in all goodness and righteousness and truth,??10 proving what is well pleasing to the Lord,

Treasury of Scripture Knowledge

Summary

Then I saw that wisdom excelleth folly, as far as light excelleth darkness.

Bible References

Light

Matthew 6:23
but if your eye is evil, your whole body will be dark. If, therefore, the light which is in you is darkness, how great is the darkness!
Luke 11:34
The light of the body is the eye; when, therefore, your eye is sound, your whole body is light; but when your eye is evil, your whole body is dark.
Ephesians 5:8
For you were formerly darkness, but now you are light in the Lord. Walk as children of light,??9 for the fruit of the light is in all goodness and righteousness and truth,??10 proving what is well pleasing to the Lord,