Belgic Confession art 37: “Finally, we believe, according to God's Word, that when the time appointed by the Lord is come (which is unknown to all creatures) and the number of the elect is complete, our Lord Jesus Christ will come from heaven, bodily and visibly, as He ascended, with great glory and majesty, to declare Himself the judge of the living and the dead. He will burn this old world, in fire and flame, in order to cleanse it.”