In context
19For the power of the horses is in their mouths and in their tails; for their tails are like serpents, having heads, and with them they inflict harm. 20The rest of humanity, those not killed by these plagues, did not repent of the works of their hands. They did not stop worshiping demons, and idols of gold, silver, bronze, stone, and wood, which cannot see or hear or walk. 21Nor did they repent of their murders, their sorceries, their sexual immorality, or their thefts.
