When, instead of examining and describing a past phase in the history of a still existing form of faith, we are called upon to examine and describe a form of faith which has wholly passed away, our task becomes infinitely greater. We have no longer the principle of continuity and development to help us; it is a new plant that we have to study, not the same plant in an earlier period of its growth. The fundamental ideas which form, as it were, its environment, are strange to us; the polytheism of Babylonia, or the animal-worship of Egypt, transports us to a world of ideas which stands wholly apart from that wherein we move. It is difficult for us to put ourselves in the place of those who saw no underlying unity in the universe, no single principle to which it could all be referred, or who believed that the dumb animals were incarnations of the divine. And yet, until we can do so, the religions of the two great cultured nations of the ancient world, the pioneers of the civilisation we enjoy to-day, will be for us a hopeless puzzle, a labyrinth without a clue. Before that clue can be found, we must divest ourselves of our _modernism_. We must go back in thought and sympathy to the old Orient, and forget, so far as is possible, the intervening ages of history and development, and the mental and moral differences between the East and the West. I say so far as is possible, for the possibility is relative only. No man can shake off the influences of the age and country of which he is the child; we cannot undo our training and education, or root out the inherited instincts with which we were born. We cannot put back the hand of time, nor can the Ethiopian change his skin. All we can do is to suppress our own prejudices, to rid ourselves of baseless assumptions and prepossessions, and to interpret such evidence as we have honestly and literally. Above all, we must possess that power of sympathy, that historical imagination, as it is sometimes called, which will enable us to realise the past, and to enter, in some degree, into its feelings and experiences.