The Church of Christ was, is and always will be undivided. However, disunity among Christians is a reality. While safeguarding the apostolic tradition in the first era of Christianity, Ephesians provides a remarkable history - more potent for ecumenism and internal reform today. This book investigates the Ecclesiology of Ephesians, with a plenitude of references to exegetes who mainly come from the German-speaking world. It is a Catholic approach to the standard features of the Church, which provides insights for a comprehensive reassessment of the Church. This book is concerned not just with defending particular doctrines. It is an honest exploration of how first-century Ecclesiology fits the milieu and context of the contemporary Church and provokes and challenges us to appreciate the diverse ecclesiological convictions.