In the Middle Ages, as in antiquity, they read usually, not as today, principally with the eyes, but with the lips, pronouncing what they saw, and with the ears, listening to the words pronounced. hearing what is called the "voices of the pages." It is a real acoustical reading.
Jean Leclercq, The Love of Learning and the Desire God: A Study of Monastic Culture
christianity, education, learning, religion