<p>21:10 <i>And he carried me away in the Spirit to a mountain great and high</i>- The 'height' of the mountain likely refers more to its glory than its literal altitude. Zion and / or the mount of Olives was the great and high mountain in the Jewish thought in which Revelation is presented. And Acts 1 and Zech. 14 envisage the Lord Jesus returning to that mountain. The exact chronology of events need not concern us; not only will the meaning / experience of time likely be changed, but the chronology must to some extent be open, because the repentance of various groups will be possible. The final outworking of events will take that into account.</p><p><i>And showed me the holy city Jerusalem coming down out of heaven from God</i>- Literal Jerusalem as the capital of Babylon will be destroyed; a new Jerusalem will literally come down to replace it. But this is not a pile of new stones, but more essentially the glorified believers, who as explained on 1 Thess. 4:14 come as it were with the Lord Jesus at this stage.</p>