Revelation to Saint John 13:11-18; 20:4; how could...

Revelation to Saint John 13:11-18; 20:4; how could Saint John make such an accurate prophecy - 20:4 "Then I saw thrones; those who sat on them were entrusted with judgment. I also saw the souls of those who have been beheaded for their witness to Jesus and for the word of God, and who has not worshipped the beast or its image nor had accepted its mark on their foreheads or hands.