The Greek philosophers, as a rule, proceeded cautiously in these matters. They passed mythology by with a conventional reverence and looked elsewhere for the true object of their personal religion. But the old mythological impulse was not yet spent; it showed itself still active in all the early philosophers who gave the godhead new incarnations congruous with the character of their respective physical systems. To the Socratic School the natural world was no longer the sphere in which divinity was to be found. They looked for the divine rather in moral and intelligible ideas. But not only did they carry the mythological instinct with them into that new field, they also retained it in the field of Nature, whenever they still regarded Nature as real. Thus Aristotle, while he rejected the anthropomorphism of the popular faith, attributing it to political exigencies, turned the forty-nine spheres, of which he conjectured that the heaven might be composed, into a pantheon of forty-nine divinities. Every primary movement, he argued, must be the expression of an eternal essence by which the movement is justified, as the movement of the mind in thinking or loving is justified by the truth or excellence of the object of thought or of love. Without such a worthy object, these spiritual activities would be irrational; and no less irrational would be the motion of the spheres, were each not obedient to the influence of some sacred and immutable principle. Forty-nine gods accordingly exist; but no more. For, since the essence of each is to be the governing ideal of a motion, the number of motions in the sky determines the number of divine first principles. The gods, we see, are still the souls of Nature; a soul without a body would be a principle without an application; there can be no gods, then, without a phenomenal function, no gods that do not appear in the operations of Nature. This astronomic mythology was surely not less poetical than that of Homer, even if, by virtue of a certain cold and abstract purity, not unworthy of the stars of which it spoke, it was more difficult and sublime. We may observe in it a last application of the ancient mythological method by which the phenomena of Nature became evidence of the existence and character of the gods.