Why then is circular motion common to all spheres, and why is the fixed position of the stars in their respective spheres common to all stars? If we, however, assume design and determination of a Creator, in accordance with His incomprehensible wisdom, all these difficulties disappear. They must arise when we consider the whole Universe, not as the result of free will, but as the result of fixed laws of Nature: a theory which, on the one hand, is not in harmony with the existing order of things, and does not offer for it a sufficient reason or argument; and, on the other hand, implies many and great improbabilities. For, according to this theory God, whose perfection in every respect is recognised by all thinking persons, is in such relation to the Universe that He cannot change anything; if He wished to make the wing of a fly longer, or to reduce the number of the legs of a worm by one, He could not accomplish it. According to Aristotle, He does not try such a thing, and it is wholly impossible for Him to desire any change in the existing order of things: if He could, it would not increase His perfection: it might, on the contrary, from some point of view, diminish it.
Although I know that many partial critics will ascribe my opinion concerning the theory of Aristotle to insufficient understanding, or to intentional opposition, I will not refrain from stating in short the results of my researches, however poor my capacities may be. I hold that the theory of Aristotle is undoubtedly correct as far as the things are concerned which exist between the sphere of the moon and the centre of the earth. Only an ignorant person rejects it, or a person with preconceived opinions of his own, which he desires to maintain and to defend, and which lead him to ignore clear facts. But what Aristotle says concerning things above the sphere of the moon is, with few exceptions, mere imagination and opinion; to a still greater extent this applies to his system of Intelligences, and to some of his metaphysical views: they include great improbabilities, [promote] ideas which all nations consider as evidently corrupt, and cause views to spread which cannot be proved.
It may perhaps be asked why I have enumerated all the doubts which can be raised against the theory of Aristotle: whether by mere doubts a theory can be overthrown, or its opposite established? This is certainly not the case. But we treat this philosopher exactly as his followers tell us to do. For Alexander stated that when a theory cannot be established by proof, the two most opposite views should be compared as to the doubts entertained concerning each of them, and that view which admits of fewer doubts should be accepted. Alexander further says that this rule applies to all those opinions of Aristotle in Metaphysics for which he offered no proof. For those that followed Aristotle believed that his opinions are far less subject to doubt than any other opinion. We follow the same rule. Being convinced that the question whether the heavens are eternal or not cannot be decided by proof, neither in the affirmative nor in the negative, we have enumerated the objections raised to either view, and shown how the theory of the Eternity of the Universe is subject to stronger objections, and is more apt to corrupt the notions concerning God [than the other]. Another argument can be drawn from the fact that the theory of the Creation was held by our Father Abraham, and by our Teacher Moses.
Having mentioned the method of testing the two theories by the objections raised against
