“The following period of nearly two hundred years shows that the union of the Church and the State, even when the powers of the mightiest Empire are put into the Church’s hands, do not enable her to save the State from destruction, for, in abandoning the position which her very name implies, of being “called out” of the world, and of separation to Christ, she loses the power that comes from subjection to her Lord, exchanging it for an earthly authority that is fatal to herself.”