In the fourth verse, he more immediately addresses the Levites, who were appointed to the office of singers, and calls upon them to employ their instruments of music – not as if this were in itself necessary, only it was useful as an elementary aid to the people of God in these ancient times.

The Psalmist, shortly afterwards, shows that he intended this to be a ground of comfort and hope under all cares, griefs, anxieties, and embarrassments.

15. That they may show that Jehovah is upright. It is evident from this verse that the great object of the Psalmist is, to allay that disquietude of mind which we are apt to feel under the disorder which reigns apparently in the affairs of this world; and to make us cherish the expectation, (under…