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His kingdom is coming physically to Earth, not rhetorically.
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You’d better tremble about that. Self superior giggling does not become your meeting to the King of Kings.
The statement is not much different than Christ’s own teaching on prayer:
“...Thy Kingdom come, Thy will be done, on earth as it is in heaven...”
It is just an acknowledgement of God’s authority and sovereignty over all that is, now and forever. It is not a claim to one or another branch of eschatology.
My main point to HT was that the power of one man was seen as more of a threat than an asset by our nation’s founders.