«The revelation of Jesus Christ, which goodness provided your to exhibit his servants — things which must briefly happen. In which he sent and signified they by their angel to his servant John» (Rev. 1:1). Two information: first, whatever happenings this publication predicts, they might «briefly happen»! How do people extend that to cover nineteen century? Jesus expose one thing to John by what Christians happened to be experiencing after that! Any understanding of Revelation that does not capture this under consideration was completely wrong, like premillennialist!
