"To tell the truth, my well beloved Brothers, you can understand the truth of what you sing only if you practice it. However I say this, in whatever way I may express it, with whatever choice of words, this word does not enter into a heart which does not practice it. Therefore begin to act, and you will understand what we are saying. Then each word of the Psalm will make the tears flow, then the Psalm is sung and the heart does what is sung in the Psalm. Alas! How many there are who chant with the voice and are remote in heart!"
-Augustine, Homilies on the Psalms, Psalm 119: The Ascents of the Christians, 8.