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The "empty thing" they keep "muttering," or meditating on, is the continuation of their own sovereignty. Nothing shakes them more than any threat to their rulership. .
The worldwide preaching of the established Kingdom of God done by Jehovah's Witnesses has become just such a threat to the nations. After all, the Messianic Kingdom of God in the hands of Jesus Christ is going to "crush and put an end to all [man-made] kingdoms." (Daniel 2:44) The message of judgment included in our preaching work is sending out a tremor among the nations. (Isaiah 61 :2) And the shaking gets more severe as the preaching work increases in
scope and intensity.