While we know that Jesus the Messiah has already come, we also know that he has not yet come in glory. We await the fullness of the messianic kingdom still to be revealed. Isaiah's oracle envisions the future glory of God's kingdom on earth, associating it with Mount Zion where the temple was located. This vision portrays Israel as a light to which all nations will stream, gathering together in Jerusalem. The prospect of nations streaming to Mount Zion is often associated by scholars with the pilgrimages of the Jewish exiles to Jerusalem.
Christians see in Zion the prefigurement of the heavenly Jerusalem.
Lord, throughout this Advent, increase my joy at the thought of being with you in heaven.