The secret of the rapture of the Church, prior to the end-time is not introduced here in this great prophetic discourse. That was still a hidden mystery when Jesus spoke these words. There is no time set for it, nor are there any signs indicated. The signs here all have to do with His revelation from heaven as the King who is to return to take His great power and reign. The coming of the Son of Man refers always to this event, never to the Rapture. The conditions depicted in verses 9 to 14 fit perfectly
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