One of the critical aspects of the "millennium" has to do with the beast in this verse:
4Then I saw thrones, and they sat on them, and judgment was given to them. And I saw the souls of those who had been beheaded because of their testimony of Jesus and because of the word of God, and those who had not worshiped the beast or his image, and had not received the mark on their forehead and on their hand; and they came to life and reigned with
Now, if Christ's Second Coming is "postmillennial" and so on, then that would mean that DEATH is everywhere on earth before He returns. In other words, that's what the "millennium" is about--DEATH.
Indeed, DEATH is the "last" enemy that Christ is currently ruling over as King right NOW during our current age:
I Cor. 15
23But each in his own order: Christ the first fruits, after that those who are Christ’s at His coming,
Let's look closely at what the souls of martyrs are really asking for in Rev. 6:
9When the Lamb broke the fifth seal, I saw underneath the altar the souls of those who had been slain because of the word of God, and because of the testimony which they had maintained;
10and they cried out with a loud voice, saying, “How long, O Lord, holy and true, will You refrain from judging . . .
Stop right there.
The souls are asking about when
It seems useful to discuss and provide a bit of commentary on the following passage: Luke 17:20-33. Additional verses will be referenced also, so here we go . . .
20 And when he was demanded of the Pharisees, when the kingdom of God should come, he answered them and said, The kingdom of God cometh not with observation:
21 Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of God is within you.
It is apparent that there are many that suggest that there shall be an "literal physical earthly reign of Christ" in our future and so on. In particular, there is a notion that the "Kingdom" will be "restored to Israel" at some point per Acts 1 and so on.
And so, it seems useful to address this directly--and with a bit of detail . . .
First of all, let's go the appropriate passage from Acts 1: