[...] by an irony of fortune we owe much of our knowledge of Hellenic and other religions of the Mediterranean area to the Christian controversialists, who reveal many of the essential features of the various pagan creeds in order to expose them to obloquy: they could not anticipate that we should gather as the fruit of their labours a better appreciation than we could otherwise have gained of the religions which they strove to destroy, and possibly of Christianity itself.