“We know that in Christendom it has been so arranged that all churches are equal, and there is only one single church of Christ in the world, as we pray, ‘I believe in one holy, Christian church.’
The reason is this: wherever there is a church, anywhere in the whole world, it still has no other gospel and Scripture, no other baptism and communion, no other faith and Spirit, no other Christ and God, no other Lord’s Prayer and prayer, no other hope and eternal life than we have here in our church in Wittenberg.”
–Martin Luther, “Against the Roman Papacy An Institution of the Devil,” Luther’s Works, Vol. 41: Church and Ministry III, ed. Jaroslav Jan Pelikan, Hilton C. Oswald, and Helmut T. Lehmann, vol. 41 (Philadelphia: Fortress Press, 1999), 41: 358.