heaven is the door of prophetic revelation. The first voice was that of the Lord Jesus Christ (1:10). The Lord summoned John to come in order that he might receive a heavenly perspective of things which must take place on Earth. John did not record the events in chronological order. The recurrences of the after these things (for example, v. 1; 7:1, 9) and such phrases as “and I saw . . . ” (10:1), “Then I was . . . ” (11:1), and “Now a great sign . . . ” (12:1) refer only to the sequence of John’s