"Before Constantine, one knew as a fact of everyday experience that there was a church, but one had to have faith that God was governing history. After Constantine, people assumed as a fact that God was governing history through the emperor, but one had to take it on faith that within this nominally Christian mass there was a community of true believers... The nature of the church vanished into the invisible realm. But in this way the New Testament message was fundamentally misunderstood, inner-worldliness became a principle."
(Stanley Hauerwas, from Performing the Faith)