[imardmd1]

Revelation tells us that those in the first resurrection will live and reign with Christ a thousand years, how can we be sure this has not already happened?

Because the Great Tribulation has not yet occurred, for one reason.

[ravenwolf]

Because the Great Tribulation has not yet occurred, for one reason.

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That is most likely true but it means nothing to me because I do not see it the same way you do.