"Saint Augustine defined idolatry as worshiping what should be used or using what should be worshiped"

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For what St. Augustine said is true, that one can sing nothing worthy of God save what one has received from Him. Wherefore though we look far and wide we will find no better songs nor songs more suitable to that purpose than the Psalms of David, which the Holy Spirit made and imparted to him. Thus, singing them we may be sure that our words come from God just as if He were to sing in us for His own exaltation. Wherefore, Chrysostom exhorts men, women, and children alike to get used to singing them, so as through this act of meditation to become as one with the choir of angels.

— William Romaine