Luke 11:35

So be on your guard that the very source of light in you is not darkness.

John 7:48-49

None of the authorities or of the Pharisees have believed in Him, have they?

John 9:39-41

Then Jesus said, "I have come into this world to judge people, so that those who do not see may see, and those who do see may become blind."

Romans 1:22

Though claiming to be wise, they made fools of themselves,

Romans 2:19-23

and if you are sure that you are a guide to the blind, a light to those in darkness,

1 Corinthians 1:19-21

For the Scripture says: "I will destroy the wisdom of the wise, and I will set aside the learning of the learned."

1 Corinthians 3:18-20

Let no one deceive himself. If any one of you supposes that he is wise in this world's wisdom, as compared with the rest of you, to become really wise he must become a fool.

James 3:13-17

Who among you is wise and intelligent? Let him show by his noble living that his good deeds are done in humility, which wisdom prompts.

2 Peter 1:9

For whoever lacks these qualities is blind -- or short-sighted-- and forgetful of the cleansing that he has received from his former sins.

2 Peter 2:18

For by uttering arrogant nonsense, through base desires of the lower nature, they entice into immorality men who are just escaping from those who live in error,

Revelation 3:17

Because you say, 'I am rich, I have already become rich, I need nothing,' and you do not know that you are the very one that is wretched, pitiable, poor, blind, and naked;

Treasury of Scripture Knowledge

Summary

Take heed therefore that the light which is in thee be not darkness.

Bible References

General references

John 7:48
None of the authorities or of the Pharisees have believed in Him, have they?
John 9:39
Then Jesus said, "I have come into this world to judge people, so that those who do not see may see, and those who do see may become blind."
Romans 1:22
Though claiming to be wise, they made fools of themselves,
Romans 2:19
and if you are sure that you are a guide to the blind, a light to those in darkness,
1 Corinthians 1:19
For the Scripture says: "I will destroy the wisdom of the wise, and I will set aside the learning of the learned."
1 Corinthians 3:18
Let no one deceive himself. If any one of you supposes that he is wise in this world's wisdom, as compared with the rest of you, to become really wise he must become a fool.
James 3:13
Who among you is wise and intelligent? Let him show by his noble living that his good deeds are done in humility, which wisdom prompts.
2 Peter 1:9
For whoever lacks these qualities is blind -- or short-sighted-- and forgetful of the cleansing that he has received from his former sins.
2 Peter 2:18
For by uttering arrogant nonsense, through base desires of the lower nature, they entice into immorality men who are just escaping from those who live in error,
Revelation 3:17
Because you say, 'I am rich, I have already become rich, I need nothing,' and you do not know that you are the very one that is wretched, pitiable, poor, blind, and naked;