Romans 1:22
professing to be wise, they became foolish,
1 Corinthians 8:4
With respect, then, to the eating of meats offered to idols, we know that an idol is nothing in the world, and that there is no other God but one.
2 Corinthians 4:4
whose unbelieving minds the god of this age has darkened, so that the light of the glorious gospel of Christ, who is the image of God, should not shine to them.
Ephesians 4:18
darkened in their understanding, alienated from the life of God through the ignorance that is in them, because of the hardness of their heart;
Ephesians 5:8
For you were formerly darkness; but now you are light in the Lord: walk as children of light;