GroshLink

Make a joyful noise. The Psalmist refers only to that part of the service of God which consists in recounting his benefits and giving thanks. And since he invites the whole of the inhabitants of the earth indiscriminately to praise the Lord, he seems, in the spirit of prophecy, to refer to the period when the Church would be gathered out of different nations. Hence he commands (verse 2) that God should be served with gladness, intimating that his kindness towards his own people is so great as to furnish them with abundant ground for rejoicing. This is better expressed in the third verse, in which he first reprehends the presumption of those who had wickedly revolted from the true God. ... We can never be at a loss for constant cause of praising him. It would be the basest ingratitude on our part, if we wearied in rendering to God the tribute of praise to which he is entitled. -- John Calvin (1509-1564), Commentary on Psalm 100.  Read this classic at the CCEL.

Amen!