Romans 1:21
Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
Nave's Topical Index—AKJV

Ephesians 4:18
Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart:
Nave's Topical Index—AKJV