Can Maimonides claim to be regarded as the originator of a new system? This is a question which has exercised various authors; but we may leave it to those who attach importance to names. We may give Maimonides that title or not: but two facts are beyond dispute. On the one hand, the fundamental assumptions on which he built up his system were not his own, but were borrowed by him almost in their entirety from the philosophy of Aristotle as presented at second hand by the Arabs, who introduced into it a good deal of neo-Platonic doctrine. But, on the other hand, it is indisputable that Maimonides carried to their logical conclusion the ethical consequences of those assumptions, as the Greeks and the Arabs, with whom the assumptions originated, did not; and in this way he did say something that was new and hitherto unsaid, though it was logically implied in the fundamental principles which he took from other thinkers. If, then, we would understand the ethical system of Maimonides, we must set clearly before our minds the metaphysical assumptions on which it was built. Those assumptions are so far removed from the philosophical and scientific conceptions of our own time that the modern man can scarcely grasp them. But in those days even the greatest thinkers believed these airy abstractions to be the solid truths of philosophy, rock-based on incontestable evidences. Hence it is not surprising that Maimonides, like the rest, was convinced beyond doubt that this “scientific” teaching was the uttermost limit of human understanding, and could never be changed or modified. So absolute, indeed, was his conviction that he went so far as to put this teaching in a dogmatic form, as though it had been a revelation from above.[89] The following is an outline of his dogmas, so far as is necessary for our purpose: “All bodies beneath the firmament are compounded of matter and form.”[90] But “form” here is not “form as vulgarly understood, which is _the picture and image of the thing_”; it is “the natural form,” that is to say, the reality of the thing, “that by virtue of which it is what it is,” as distinct from other things which are not of its kind.[91] “Matter is never _perceived_ without form, nor form without matter; it is man who divides existing bodies in his consciousness, and _knows_ that they are compounded of matter and form.”[92] For since the form is the reality, by virtue of which the thing is what it is, it follows that matter without form would be a thing without a real existence of its own: in other words, a mere intellectual abstraction. And it is superfluous to add that form without matter does not exist in the sublunar world, which consists wholly of “bodies.”[93]