Saint Augustine has received the formation of an orator: when he was sitting in his episcopal cathedra, a book lying open of his knees, he found himself in circumstances somewhat similar to the situation which was his in his preceeding career. How did the pastor of Hippo bring the techniques of classical oratory to the service of the Word of God? How did he conciliate the demands of biblical eloquence and those of the art of oratory? The present article tries to answer theses questions while pinpointing the general outlines of Augustine's preaching.