Complete Extant Works of Saint Ambrose, Vol. I

For I could not ask him what I wanted, in the way I wanted, because I was cut off from his ear and mouth by crowds of busy people whose needs he served. When he was not with them—which was a very small amount of time—he either refreshed his body with necessary sustenance or his mind with reading. But when he read, his eyes were led over the pages and his heart searched out the meaning, but his voice and tongue were silent. Often when we were present—for no one was forbidden to enter, nor was it the custom to announce someone's arrival—we saw him reading silently and never otherwise, and sitting in long silence (for who would dare to disturb him when he was so intent?), we would depart... I heard him rightly handling the word of truth among the people every Lord's Day, and it was confirmed to me more and more that all the knots of those crafty slanders, which our deceivers were tying against the divine Books, could be undone. (Book 6, ch. 3)

Thus, according to the prediction of St. Ambrose, when he had comforted the weeping Monica with these words: It is impossible that the son of so many tears should perish, Augustine, having turned toward better things, received baptism at his hands.