Its sad to see in Revelation chapter nine, that after six trumpets of God, God’s judgement, that man still refuses to turn back to God. The word “repent” in these Bibles verses simply mean to turn back to God, or change one’s mind back to God. Man refuses to acknowledge that God is the creator and owner of the earth and the universe.

Rev 9:20  And the rest of the men which were not killed by these plagues yet repented not of the works of their hands, that they should not worship devils, and idols of gold, and silver, and brass, and stone, and of wood: which neither can see, nor hear, nor walk: 21 Neither repented they of their murders, nor of their sorceries, nor of their fornication, nor of their thefts.