" The Roman church’s unmistakable claim is that there is only one church and only one faith and that Christendom needs a visible head, a chief shepherd, to guide the church and to care for the faithful with fatherly care. The longing for a lost Western empire, longing for the corpus christianum in which emperor and pope together are guardians of the unity of the Christian West, cannot fade away as long as there is a papacy. "

― Dietrich Bonhoeffer , Ethics (Works, # 6)