The first question that confronts us as we enter upon the discussion is the preliminary inquiry: What had been done already in the way of theistic argument, and in what condition did the Christian Church find this argument when it first began to develop a system of apologetics? And from the conditions of ancient thought, or, at least, from what we know of it, this resolves itself into the question: How far had the Greek philosophers advanced by means of speculative thought toward a conscious theism, and by what means did the various individuals and schools among them seek to prove the existence of the Divine? The answer to this inquiry will involve a brief examination of the contributions of the pre-Socratic philosophers (especially Anaxagoras), Socrates, Plato, Aristotle, the Stoics, the Epicureans, Cicero, and the Hellenizing Jews of Alexandria. The thought of Greece before the time of Socrates, from the very nature of its problem, and the material at its disposal, yields us but little that can, without doing violence to the facts, be construed as bearing on the theistic argument. The search of these early philosophers was, indeed, for an Ἀρχή, but their interest in the inquiry, as a perusal of the extant fragments of their writings will prove, was pre-eminently cosmological. They strove to discover the eternal ground of all things, but it was a principle to account for the phenomena of _physical_ nature that they sought, and they had not attained to a realization of even a rude form of the theistic problem. All they sought for was a primary substance which should satisfy the needs of a rudimentary physical science, which would enable them to co-ordinate the scanty data which they had accumulated from their contact with the world in which they lived, and to whose secrets they seem at times, in spite of their limited knowledge, to have come very close. And even granting that the problem involved in their search for the Ἀρχή was at bottom identical with that of theism, they attempt to give no proof or argument for their conclusions with regard to it. They are as yet merely _seers_, who report the vision that comes to them as they gaze upon the stress and strain and ever-changing spectacle of earth's phenomena. Even the teleology of Anaxagoras (often mentioned as the germ of the theistic argument) gives us nothing more than a poet's dream, expressed, as Diogenes Laertius informs us, in a "lofty and agreeable style."[2] "Nous," Anaxagoras tells us, "is infinite and self-ruled, and is mixed with nothing, but is alone, itself by itself.... It has all knowledge about everything, and the greatest strength; and Nous has power over all things, both greater and smaller, that have life. And Nous had power over the whole revolution, so that it began to revolve in the beginning.... And Nous set in order all things that were to be and that were, and all things that are not now, and that are, and this revolution