An Essay on the Development of Christian Doctrine

On the whole, then, we have reason to say, that if there be a form of Christianity at this day distinguished for its careful organization, and its consequent power; if it is spread over the world; if it is conspicuous for zealous maintenance of its own creed; if it is intolerant towards what it considers error; if it is engaged in ceaseless war with all other bodies called Christian; if it, and it alone, is called "Catholic" by the world, nay, by those very bodies, and if it makes much of the title; if it names them heretics, and warns them of coming woe, and calls on them one by one, to come over to itself, overlooking every other tie; and if they, on the other hand, call it seducer, harlot, apostate, Antichrist, devil; if, however much they differ one with another, they consider it their common enemy; if they strive to unite together against it, and cannot; if they are but local; if they continually subdivide, and it remains one; if they fall one after another, and make way for new sects, and it remains the same; such a religious communion is not unlike historical Christianity, as it comes before us at the Nicene Era.

Chapter 6 - Section 3