Revelation 1:9

I John — The instruction and preparation of the apostle for the work are described from Revelation 1:9. Your brother — In the common faith. And companion in the affliction — For the same persecution which carried him to Patmos drove them into Asia. This book peculiarly belongs to those who are under the cross. It was given to a banished man; and men in affliction understand and relish it most. Accordingly, it was little esteemed by the Asiatic church, after the time of Constantine; but highly valued by all the African churches, as it has been since by all the persecuted children of God. In the affliction, and kingdom and patience of Jesus — The kingdom stands in the midst. It is chiefly under various afflictions that faith obtains its part in the kingdom; and whosoever is a partaker of this kingdom is not afraid to suffer for Jesus, 2 Timothy 2:12. I was in the island Patmos — In the reign of Domitian and of Nerva. And there he saw and wrote all that follows. It was a place peculiarly proper for these visions. He had over against him, at a small distance, Asia and the seven churches; going on eastward, Jerusalem and the land of Canaan; and beyond this, Antioch, yea, the whole continent of Asia. To the west, he had Rome, Italy, and all Europe, swimming, as it were, in the sea; to the south, Alexandria and the Nile with its outlets, Egypt, and all Africa; and to the north, what was afterwards called Constantinople, on the straits between Europe and Asia. So he had all the three parts of the world which were then known, with all Christendom, as it were, before his eyes; a large theatre for all the various scenes which were to pass before him: as if this island had been made principally for this end, to serve as an observatory for the apostle. For preaching the word of God he was banished thither, and for the testimony of Jesus — For testifying that he is the Christ.