Revelation 14 speaks of the preaching of the gospel to all the nations before the fall of “Babylon.” What Revelation describes is what Jesus commanded in the Olivet Discourse!
There is a divine pattern found in the Olivet Discourse, in the section that all amillennialists and postmillennialists agree refers to the events leading up to and consummating in AD 70. That pattern gives us defintive proof that Revelation was written before AD 70, and applied to that age changing event. I just posted a new video on this important subject, so check it out and pass it on!
Also, my book, Into All the World, Then Comes The End, has the only discussion of this pattern to be found anywhere! YouTube viewers can get free shipping on orders of this book!