What an obvious flow of thought this final psalm has! After telling us where to praise God (in v. 1) and reminding us why we should praise him (in v. 2), the next three verses, exactly one-half of the psalm, tell us how God should be praised (vv. 3-5). 

Where should this be done? Where should "everything that has breath” praise God? The first verse gives us a comprehensive answer. It is “in his sanctuary" and “in his mighty heavens.” 

It is time to make noise, praise-noise for God. Not all worship should be noisy, of course. There are psalms of lament that call for heart-rending sorrow by God's people. Other psalms call for quiet reflection on the acts of God in history, acts that are sometimes puzzling and even incomprehensible to us. But there are times for celebration too. When David brought the ark to Jerusalem, to the place he had prepared for it, the arrival of the ark was announced by trumpets and David danced with abandon before God (2 Sam. 6:14, 15). When the people praised God for the completion of the building of the walls of Jerusalem in Nehemiah's day, the sound of trumpets, cymbals, harps, lyres and singing was so loud that “the sound of rejoicing in Jerusalem could be heard far away” (Neh. 12:43; see vv. 27-44). 

We love the old songs, of course, just as we love the old doctrines (Jer. 6:16). But each generation has fresh lessons of God's grace, and new experiences of God's grace call for new songs. Israel had experienced God's goodness in bringing the people back to their homeland and (probably) giving them a military victory. So they composed this psalm. 

In yesterday’s study, I concluded with the point that while Christians can serve as soldiers, they are not to try to advance the work of God by killing its enemies.