In the second century, Valentinians and other gnosticizing Christians used numerical structures and symbols to describe God, interpret the Bible, and frame the universe. In this study of the controversy that resulted, Joel Kalvesmaki shows how earlier neo-Pythagorean and Platonist number symbolism provided the impetus for this theology of arithmetic, and describes the ways in which gnosticizing groups attempted to engage both the Platonist and Christian traditions. He explores the rich variety of number symbolism then in use, among both gnosticizing groups and their orthodox critics, demonstrating how those critics developed an alternative approach to number symbolism that would set the pattern for centuries to come. Arguing that the early dispute influenced the very tradition that inspired it, Kalvesmaki explains how, in the late third and early fourth centuries, numbers became increasingly important to Platonists, who engaged in arithmological constructions and disputes that mirrored the earlier Christian ones.

All Religion Is Inter-Religion analyses the ways inter-religious relations have contributed both historically and philosophically to the constructions of the category of "religion" as a distinct subject of study. Regarded as contemporary classics, Steven M. Wasserstrom's Religion after Religion (1999) and Between Muslim and Jew (1995) provided a theoretical reorientation for the study of religion away from hierophanies and ultimacy, and toward lived history and deep pluralism. This book distills and systematizes this reorientation into nine theses on the study of religion. Drawing on these theses--and Wasserstrom's opus more generally--a distinguished group of his colleagues and former students demonstrate that religions can, and must, be understood through encounters in real time and space, through the complex relations they create and maintain between people, and between people and their pasts. The book also features an afterword by Wasserstrom himself, which poses nine riddles to students of religion based on his personal experiences working on religion at the turn of the twenty-first century.