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 premised these axioms, I ask the following question: Aristotle holds that the first Intelligence is the cause of the second, the second of the third, and so on, till the thousandth, if we assume a series of that number. Now the first Intellect is undoubtedly simple. How then can the compound form of existing things come from such an Intellect by fixed laws of Nature, as Aristotle assumes? We admit all he said concerning the Intelligences, that the further they are away from the first, the greater is the variety of their compounds, in consequence of the larger number of the objects comprehensible by the Intelligences: but even after admitting this, the question remains, By what law of Nature did the spheres emanate from the Intelligences? What relation is there between material and immaterial beings? Suppose we admit that each sphere emanates from an Intelligence of the form mentioned; that the Intelligence, including, as it were, two elements, in so far as it comprehends itself and another thing, produces the next Intelligence by the one element, and a sphere by the other; but the question would then be, how the one simple element could produce the sphere, that contains two substances and two forms, namely, the substance and the form of the sphere, and also the substance and the form of the star fixed in that sphere. For, according to the laws of Nature, the compound can only emanate from a compound. There must therefore be one element, from which the body of the sphere emanates, and another element, from which the body of the star emanates. This would be necessary even if the substance of all stars were the same; but it is possible that the luminous stars have not the same substance as the non-luminous stars; it is besides well known that each body has its own matter and its own form. It must now be clear that this emanation could not have taken place by the force of the laws of Nature, as Aristotle contends. Nor does the difference of the motions of the spheres follow the order of their positions: and therefore it cannot be said that this difference is the result of certain laws of Nature. We have already mentioned this (ch. xix.).

There is in the properties of the spheres another circumstance that is opposed to the assumed laws of Nature; namely, if the substance of all spheres is the same, why does it not occur that the form of one sphere combines with the substance of another sphere, as is the case with things on earth, simply because their substance is fit [for such changes]? If the substance of all spheres is the same, if it is not assumed that each of them has a peculiar substance, and if, contrary to all principles, the peculiar motion of each sphere is no evidence for the special character of its substance, why then should a certain form constantly remain united with a certain substance? Again, if the stars have all one substance, by what are they distinguished from each other? is it by forms? or by accidents? Whichever be the case, the forms or the accidents would interchange, so that they would successively unite with every one of the stars, so long as their substance [being the same] admits the combinations [with every one of the forms or the accidents]. This shows that the term substance, when used of the spheres or the stars, does not mean the same as it signifies when used of the substance of earthly things, but is applied to the two synonymously. It further shows that every one of the bodies of the spheres has its own peculiar form of existence different from that of all other beings.