They are darkened in their understanding, being alienated from the life of God because of the ignorance that is in them due to the hardness of their hearts.
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Rev 9:2
He opened the shaft of the abyss and smoke rose out of it like smoke from a giant furnace. The sun and the air were darkened with smoke from the shaft.
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Rev 16:10
Then the fifth angel poured out his bowl on the throne of the beast so that darkness covered his kingdom, and people began to bite their tongues because of their pain.