John Trapp on Haggai 2:21

Verſe 21. Speak to Zerubbabel governour of Judah] Governours are ſure to meet with many difficulties, and diſcouragements (high-ſeats are never but uneaſie) and had need therefore of ſingular conſolation, that they may hold on their courſe, like the Sun in the firmament, and ſhew themſelves to be of an undaunted reſolution. We may well ſay to Governours, as that Propheticall Simeon ſpoke to the pillars which he whipped before the earth-quake: Stand faſt, for yee ſhall be ſhaken.

I will ſhake the heavens and the earth ſc. by abrogating and aboliſhing both Jewiſh Ceremonies, and Heatheniſh ſuperſtitions, Heb. 12.27. As alſo by Nationall commotions, and tranſlations of Monarchies: The Greeks ſhall break the power of the Perſians, the Romans of the Greeks, the Goths and other barbarous nations of the Romans. But eſpecially, by caſting the devil out of the heaven of mens hearts, Luke 10.18. thoſe ſtrong-holds wherein he had entrenched himſelf,Mat. 24.7. 2 Cor. 10.4, 5. that the ranſomed of the Lord may receive a kingdome, which cannot bee moved, Heb. 12.28. and partake of thoſe new heavens, and new earth wherein dwelleth righteouſneſſe, 2 Pet. 3.13. even that world to come, as theſe dayes of the Goſpel are called, Heb. 2.5. See the Note above on verſ. 6.7.