This paper argues that in Augustine rationality in religion depends in important respects on religious social practice. This point is developed in reference to the questions of the reasonableness of a commitment to a particular religion, the meaningfulness of religious terms and concepts, and the truth and falsity of religious claims. In a concluding section, I contend that Augustine, while giving rationality in religion a basis in religious practice. succeeds in avoiding the tendency, found in some otherwise similar contemporary positions. (...) to sever rationality in religion from rationality in other domains of inquiry. (shrink)