A converted church in a corrupt
civilization withdraws to its upper rooms, into monasteries and conventicles; it issues forth from these in the aggressive evangelism
of apostles, monks and friars, circuit riders and missionaries; it relaxes its rigorism as it discerns
signs of repentance and faith; it enters into inevitable alliance with converted emperors and governors, philosophers and artists, merchants and entrepreneurs, and begins to live at peace in the culture they produce under the stimulus
of their faith; when faith
loses its force, as generation follows generation, discipline is relaxed, repentance grows formal, corruption enters with idolatry, and the church, tied to the culture which it sponsored, suffers corruption with it.