Tremble

The psalms often mention people trembling before the Lord.  It sounds like shaking-in-your-boots, terrified panic.  I'm pretty sure that's the intent of the word in the original language.

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.