3:21 'He who overcomes, I will grant him to sit down with Me on My Throne; as I also overcame and sat down with My Father on His Throne.
'He who overcomes,
I will grant him to SIT DOWN with Me on My Throne; as I also overcame and sat down with My Father on His Throne.
We have seen earlier in Revelation 1:6, Revelation 1:9, and Revelation 2:27, that we, along with John, anticipate to reign with Christ. Here it is outright promised to the Laodicean church (and we, too, if we overcome).
Later, during one of the praise sessions in Revelation 5:10 and in the thousand year period in Revelation 20:4, the 24 elders, the four living creatures, and the martyrs also indicate this joint reign.
Just as a side note: there is a clear distinction between the Father's Throne and Christ's Throne. It appears that Christ's Throne is preeminent from his resurrection until all things (including death) are "put under His feet" - 1 Corinthians 15:20-28. At that time, then even Christ and His Throne (and us) will be subject completely to God (as we are now, too).
Lastly, all 'overcomer' promises (see format of church letters) show up again in the heavenly throne era. This proves that John's visions were organized and complete. Here are the seven overcomer promises again.
So each type of church will be represented in the final age! The question then becomes: WILL YOU BE THERE????