Revelation 21:23 (HCSB)

The city does not need the sun or the moon to shine on it, because God’s glory illuminates it, and its lamp is the Lamb.

     The end of the sun and moon.  The two great lights that God created to rule the day and night will no longer be necessary at the end of the ages.  In the city of God, the glory of God and of the Lamb is far greater than any light put out by the sun or moon (which reflects the sun).  
     God’s people will live and worship by the light of God himself.  His glory will be all we need in heaven.
     Are you looking forward to God’s glory, dear reader?  The end of the ages is coming, whether you are looking forward to it or not.  You will bow before God’s glory whether you want to or not.  I want to!