Before Constantine ‘Christians had known as a fact of experience that the church existed, but had to believe against appearances that Christ ruled over the world. After Constantine one knew as a fact of experience that Christ was ruling over the world, but had to believe against the evidence that there existed a believing Church.’
Rodney Clapp in A Peculiar People: The Church as Culture in a Post-Christian Society, quoting from John Howard Yoder in “The Otherness of the Church” in Mennonite Quarterly Review 35 (October 1961: 212)