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 of no use whatever: for the Intelligences are not corporeal, and have no local relation to the spheres. Why then should the one sphere in its desire to approach the Intelligence, move eastward, and another westward? Is the one Intelligence in the east, the other in the west? or why does one move with great velocity, another slowly? This difference is not in accordance with their distances from each other, as is well known. We must then say that the nature and essence of each sphere necessitated its motion in a certain direction, and in a certain manner, as the consequence of its desire to approach its Intelligence. Aristotle clearly expresses this opinion. We thus have returned to the part from which we started: and we ask, Since the substance of all things is the same, what made the nature of one portion different from another? Why has this sphere a desire which produces a motion different from that which the desire of another sphere produces? This must have been done by an agent capable of determining. We have thus been brought to examine two questions:-- (1) Is it necessary to assume that the variety of the things in the Universe is the result of Design, and not of fixed laws of Nature, or is it not necessary? (2) Assuming that all this is the result of Design, does it follow that it has been created after not having existed, or does Creatio ex nihilo not follow, and has the Being which has determined all this done always so? Some of those who believe in the Eternity of the Universe hold the last opinion. I will now begin the examination of these two questions, and explain them as much as necessary in the following chapters.

CHAPTER XX
ACCORDING to Aristotle, none of the products of Nature are due to chance. His proof is this: That which is due to chance does not reappear constantly nor frequently, but all products of Nature reappear either constantly or at least frequently. The heavens, with all that they contain, are constant: they never change, as has been explained, neither as regards their essence nor as regards their place. But in the sublunary world we find both things which are constant and things which reappear frequently [though not constantly]. Thus, e.g., the heat of fire and the downward tendency of a stone are constant properties, whilst the form and life of the individuals in each species are the same in most cases. All this is clear. If the parts of the Universe are not accidental, how can the whole Universe be considered as the result of chance? Therefore the existence of the Universe is not due to chance. The following is, in short, the objection which Aristotle raises against one of the earlier philosophers who assumed that the Universe is the result of chance, and that it came into existence by itself, without any cause

Some assume that the heavens and the whole Universe came into existence spontaneously, as well as the rotation and motion [of the spheres], which has produced the variety of things and established their present order. This opinion implies a great adsurdity. They admit that animals and plants do not owe their existence or production to chance, but to a certain cause, be that cause Nature, or reason, or the like: e.g., they do not assume that everything might be formed by chance of a certain seed or semen, but that of a certain seed only an olive-tree is produced, and of a certain semen only a