" In the sixteenth century the unity of western European Christendom had been shattered by the rise of Protestantism in its various strands (Lutheran, Calvinist, and Anglican). While the state was regarded as part of the body of Christ, the concept of sharing a political community with those of differing doctrinal commitments was unthinkable. And so it remained at first. Protestant reformers and their Catholic adversaries all insisted that one of the main aims of government was to maintain "true religion." They disagreed, of course. as to which brand of Christianity was true. Thus European history in the sixteenth and seventeenth centuries became a chronicle of civil war, of massacre, and of the expulsion of religious minorities. The notion of religious toleration grew less out of any particular brand of Christianity than out of the fear and frustration of protracted civil war. (p. 24) "

― Jerry Z. Muller , The Mind and the Market: Capitalism in Western Thought