Just think, if you knew the future, if you knew what would happen 10, 20, 100 years from now, wouldn’t you live differently? Wouldn’t you alter your actions in reaction to the future, to make the best of your life?
In Revelation 21 (and Isaiah 60) we witness the future, when people from all over the earth will stream to see the city that is to come! Notice that the City of God is not a lazy city; it’s not filled with cherubim on clouds popping grapes into the mouths of the elect. Zion contains the domains of a normal city.