This is the definitive edition of St Augustine's fourth book of De Doctrina Christiana, the book that deals with rhetoric and its uses in Christian discourse. The edition of DDC contains both the original Latin and Sister Terese Sullivan's brilliant translation. An introduction discusses the historical importance of DDC. Seven seminal essays written during the last seventy-five years provide representative discussions of the important topics of DDC. The volume includes a detailed, synoptic outline of all four books, with a conclusion by Amy K Hermanson that synthesises Augustine's rhetorical theory in a religious context. This is the only edition of its kind. It will remain the standard for a long time to come.