They [Moses and the prophets] can indeed utter words, but they give not the spirit. They speak with exceeding beauty, but when You are silent they kindle not the heart. They give us scriptures, but You make known the sense thereof. They bring us mysteries, but You reveal the things which are signified. They utter commandments, but You help in the fulfilling of them. They show the way, but You give strength for the journey. They act only outwardly, but You instruct and enlighten the heart. They water, but You give the increase. They cry with words, but You give understanding to the hearer.
Imitation of Christ, III, 2:2