Ecumenism is generally done by theologians, but as Charles Morerod, OP makes clear in this groundbreaking book the divisions between Christians often have at their roots different philosophical pre-understandings. Furthermore, ecumenical dialogue itself is often conceived along lines similar to the progress one might hope to make in reconciling divergent scientific paradigms. Morerod sheds much needed light on the ecumenical issues and approaches that offer a path toward Christian unity.