Romans 1:22
professing to be wise, they became fools,
1 Corinthians 8:4
Concerning the eating of the things offered in sacrifice to idols, then, we know that an idol is nothing in the world, and that there is no other God but one.
2 Corinthians 4:4
in whom the God of this world blinded the understandings of the unbelieving, so that they cannot behold the light of the gospel of the glory of Christ, who is the image of God.
Ephesians 4:18
having their understanding darkened, being alienated from the life of God on account of the ignorance that is in them, on account of the hardness of their hearts;
Ephesians 5:8
For ye were once darkness, but now ye are light in the Lord. Walk as children of light,