Psalms 32:2

In the present instance He is a guest with us. For the apostle adds again, “Teaching and admonishing one another in all wisdom, in psalms, and hymns, and spiritual songs, singing with grace in your heart to God.” And again, “Whatsoever ye do in word or deed, do all in the name of the Lord Jesus, giving thanks to God and His Father.” This is our thankful revelry. And even if you wish to sing and play to the harp or lyre, there is no blame. Thou shalt imitate the righteous Hebrew king in his thanksgiving to God. “Rejoice in the Lord, ye righteous; praise is comely to the upright,” says the prophecy. “Confess to the Lord on the harp; play to Him on the psaltery of ten strings. …

26. Not a few things, too, are closed against us and obscured by ignorance of music. One man, for example, has not unskillfully explained some metaphors from the difference between the psaltery and the harp. And it is a question which it is not out of place for learned men to discuss, whether there is any musical law that compels the psaltery of ten chords to have just so many strings; or whether, if there be no such law, the number itself is not on that very account the more to be considered as of sacred significance, either with reference to the ten commandments of the law (and if again any question is raised about that number, we can only refer it to the Creator and the creature), or with reference to the number ten itself as interpreted above. …

Blessed, therefore, is the olive tree “whose iniquities are forgiven, and whose sins are covered;” blessed is it “to which the Lord hath not imputed sin.” But this, which has received the remission, the covering, and the acquittal, even up to the complete change into an eternal immortality, still retains a secret force which furnishes seed for a wild and bitter olive tree, unless the same tillage of God prunes it also, by remission, covering, and acquittal. There will, however, be left no corruption at all in even carnal seed, when the same regeneration, which is now effected through the sacred laver, purges and heals all man’s evil to the very end. By its means the very same flesh, through which the carnal mind was formed, shall become spiritual, no longer having that carnal lust which resists the law of the mind, no longer emitting carnal seed. …

2. “Praise the Lord with harp:” praise the Lord, presenting unto Him your bodies a living sacrifice. “Sing unto Him with the psaltery for ten strings” ( ver. 2 ): let your members be servants to the love of God, and of your neighbour, in which are kept both the three and the seven commandments.