In dealing, therefore, with the problem before us, we must endeavour to realize to ourselves the whole mental attitude of the Greek world in the first three centuries of our era. We must take account of the breadth and depth of its education, of the many currents of its philosophy, of its love of literature, of its scepticism and its mysticism. We must gather together whatever evidence we can find, not determining the existence or measuring the extent of drifts of thought by their literary expression, but taking note also of the testimony of the monuments of art and history, of paintings and sculptures, of inscriptions and laws. In doing so, we must be content, at any rate for the present and until the problem has been more fully elaborated, with the broader features both of the Greek world and of the early centuries. The distinctions which the precise study of history requires us to draw between the state of thought of Greece proper and that of Asia Minor, and between the age of the Antonines and that of the Severi, are not necessary for our immediate purpose, and may be left to the minuter research which has hardly yet begun. 2. The second consideration is, that no permanent change takes place in the religious beliefs or usages of a race which is not rooted in the existing beliefs and usages of that race. The truth which Aristotle enunciated, that all intellectual teaching is based upon what is previously known to the person taught,[1] is applicable to a race as well as to an individual, and to beliefs even more than to knowledge. A religious change is, like a physiological change, of the nature of assimilation by, and absorption into, existing elements. The religion which our Lord preached was rooted in Judaism. It came “not to destroy, but to fulfil.” It took the Jewish conception of a Father in heaven, and gave it a new meaning. It took existing moral precepts, and gave them a new application. The meaning and the application had already been anticipated in some degree by the Jewish prophets. There were Jewish minds which had been ripening for them; and so far as they were ripe for them, they received them. In a similar way we shall find that the Greek Christianity of the fourth century was rooted in Hellenism. The Greek minds which had been ripening for Christianity had absorbed new ideas and new motives; but there was a continuity between their present and their past; the new ideas and new motives mingled with the waters of existing currents; and it is only by examining the sources and the volume of the previous flow that we shall understand how it is that the Nicene Creed rather than the Sermon on the Mount has formed the dominant element in Aryan Christianity. * * * * *