During the years between Augustine's ordination to the priesthood (391) and his consecration as the Bishop of Hippo (395 or 396), he took an intense interest in biblical exegesis. One of the fruits of his penetrating investigations is his two-volume Commentary on the Lord's Sermon on the Mount, of which a lucid English translation is presented in this volume. Also included are Augustine's subsequent, self-critical remarks (Retractationes 1.19) on this commentary, as well as seventeen selected sermons on topics relevant to the commentary.