Psalms 99:1

1Jehovah reigns The people, who were formerly called upon to rejoice, are now commanded to tremble. For as the Jews were encompassed by enemies, it was of the utmost importance that God’s power should be magnified among them, that they might know that, while under his guardianship, they would be constantly and completely safe from the hatred and fury of every foe. The Hebrew word רגז, ragaz, as we have elsewhere seen, sometimes signifies to tremble, at other times, to be angry, and, in short, denotes any strong emotion arising either from anger or fear. (115) Accordingly, the prophet here intends that God, in the emancipation of his chosen people, should give such a palpable display of his power, as would strike all the nations with dismay, and make them feel how madly they had rushed upon their own destruction. For it is with regard to men that God is said to reign, when he exalts himself by the magnificent displays which he gives of his power; because, while the aid which he gives to them remains invisible, unbelievers act a more presumptuous part, just as if there were no God.