Singing the Psalms There are in brief three things that our Lord has commanded us to observe in our spiritual assemblies, namely, the Preaching of his Word, the public and solemn prayers, and the administration of his sacraments. As to the public prayers, these are of two kinds: some are offered by means of words alone, the others with song.... We know by experience that song has great force and vigor to move and inflame the hearts of men to invoke...
