Augustine of Hippo is especially appropriate for the theme of this volume. He is acknowledged as a Father and Doctor of the Church, that is, as an authoritative Christian writer from the early centuries of the Church, and as a major theologian. Patristics, the study of the Fathers, used to be where it all started in terms of Church teaching: wherever possible, doctrines and practices were traced back to the Fathers. In the last half-century of early Christian studies there has been much more emphasis on ecclesiastical history, on the intellectual and political detail of a specific historical context. So patristics is where it all starts in that we can see Church leaders working out their responses to problems and tensions that recur through the history of the Church. In the case of Augustine, there is an unusual range of evidence from his own sermons and letters and theological treatises, and from records of Church councils in Roman Africa from the years when he was bishop (395 to 430). On the older model of patristics, Augustine was taken as the source for some of the most extreme forms of Church discipline. His writings were conflated to produce coherent ‘Augustinian’ doctrine. Phrases and sentences, images and speculation, were taken out of context to be used for purposes he never envisaged. On the newer model of early Christian studies, we can trace Augustine’s reflections about when and how to discipline people who appear to be rejecting the fundamental Christian principles, love of God and love of neighbour.