The Godly One’s Chief Good
David commited this psalm to the chief musician or precentor, and it was to be accompanied by a stringed instrument. So the psalm was not for private worship, but for public use. As in Psalm 3, which may have been the same episode in his life, David’s spirit is calmed, and he could lay down and pillow his head in peace and feel secure. He exhorts us to “Put your trust in the Lord,” and that is the source of Christian tranquillity, and peace that passeth all knowledge.