“A psalm is souls’ calm, herald of peace, hushing the swell and agitation of thoughts.  It soothes the passions of the soul; it brings her license under law.  A psalm is welder of friendship, atonement of adversaries, reconciliation of haters.  Who can regard a man as his enemy, when they have lifted up one voice to God together?  So Psalmody gives us the best of all boons, love.  Psalmody has bethought her of concerted singing as a mighty bond of union, and links the people together in a symphony of one song.  A psalm puts fiends to flight, and brings the aid of angels to our side; it is armour in the terrors of the night; in the toils of the day it is refreshment; to infants it is a protection, to men in life’s prime a pride, to elders a consolation, to women an adornment.  It turns wastes into homes.  It brings wisdom into marts and meetings.  To beginners it is an alphabet, to all who are advancing an improvement, to the perfect a confirmation.  It is the voice of the church.  It gladdens feasts.  It produces godly sorrow.  It brings a tear even from a heart of stone.  A psalm is angels’ work, the heavenly conversation, the spiritual sacrifice.  Oh, the thoughtful wisdom of the Instructor Who designed that we should at one and the same time sing and learn to our profit!  It is thus that His precepts are imprinted on our souls.  A lesson that is learned unwillingly is not likely to last, but all that is learned with pleasure and delight effects a permanent settlement in our souls.  What can you not learn from this source?  You may learn magnificent manliness, scrupulous righteousness, dignified self-control, perfect wisdom.  You may learn how to repent, and how far to endure.  What good thing can you not learn?  There is a complete theology; cf. p. 7, note. a foretelling of the advent of Christ in the flesh; threatening of judgment; hope of resurrection; fear of chastisement; promise of glory; revelation of mysteries.  Everything is stored in the book of the Psalms as in some vast treasury open to all the world.  There are many instruments of music, but the prophet has fitted it to the instrument called Psaltery.  I think the reason is that he wished to indicate the grace sounding in him from on high by the gift of the Spirit, because of all instruments the Psaltery is the only one which has the source of its sounds above. Cassiodorus (Præf. in Ps. iv.) describes a psaltery shaped like the Greek Δ, with the sounding board above the strings which were struck downwards.  cf. St. Aug. on Ps. xxxii. and Dict. Bib. s.v.  In the case of the cithara and the lyre the metal gives forth its sound at the stroke of the plectrum from below.  The Psaltery has the source of its melodious strains above.  So are we taught to be diligent in seeking the things which are above, and not to allow ourselves to be degraded by our pleasure in the music to the lusts of the flesh.  And what I think the word of the Prophet profoundly and wisely teaches by means of the fashion of the instrument is this,—that those whose souls are musical and harmonious find their road to the things that are above most easy.”