This psalm beautifully calls for all peoples to praise the Lord because of His saving power and because He rules with justice.
Reading this psalm reminds me of a book I read a few years ago. (And if I can remember the name of it I'll let you know.) The idea behind the book was that we should be involved in missions because God deserves and desires worshippers. As we share salvation through Jesus Christ we give people a reason to praise and worship God. Sharing the Gospel with all peoples leads to John's vision in Revelation.
Revelation 5:9 And they sang a new song, saying: “You are worthy to take the scroll and to open its seals, because you were slain, and with your blood you purchased for God persons from every tribe and language and people and nation.
We should be involved in going on mission as we have opportunity, but a cool thing that is happening now is that the nations are coming to us. Nashville and Clarksville have people from many different nations that are now a part of our communities. As God's people, we need to find ways to reach out around the world and in our own backyards.
And we should be praising God through everything we do.