But there's another kind of trembling. Trembling with excitement, with anticipation.
The Lord reigns; let the peoples tremble! He dwells between the cherubim. Let the earth be moved (Ps 99).Later in the psalm He is called "God-Who-Forgives" though He takes vengeance on sinful deeds. He forgives. He promises. We have some things to anticipate, things to look forward to.