The Westminster Shorter Catechism says that the chief end of man is to glorify God.  An argument could then be made that one of our purposes for being here is to worship God, which is a theme of the psalms we read for today.  There is a temptation sometimes to think that we should praise the Lord for the things He has done for us, and while that’s not necessarily a bad reason to praise Him, we should also find ourselves praising Him simply for Who He is.  Whether God forgives you or not, He should be praised.  Whether He blesses you or not, He should be praised.  His Name is great because He is great.  We praise the Lord for Who He is over and above of what He has done.