Pope Leo XIII

 St. Gregory the Great, whom no one has more admirably described the pastoral office, writes in the same sense: "Those," he says, "who are zealous in the work of preaching must never cease the study of the written word of God."(20) St. Augustine, however, warns us that "vainly does the preacher utter the Word of God exteriorly unless he listens to it interiorly;"(21) and St. Gregory instructs sacred orators "first to find in Holy Scripture the knowledge of themselves, and then to carry it to others, lest in reproving others they forget themselves."(22)