tenth Intelligence is the Active Intellect. The existence of the latter is proved by the transition of our intellect from a state of potentiality to that of actuality, and by the same transition in the case of the forms of all transient beings. For whatever passes from potentiality into actuality, requires for that transition an external agent of the same kind as itself. Thus the builder does not build the storehouse in his capacity of workman, but in that of a person that has the form of the storehouse in his mind; and that form of the building which exists in the mind of the builder caused the transition of the potential form of the storehouse into actuality, and impressed it on the material of the building. As that which gives form to matter must itself be pure form, so the source of intellect must itself be pure intellect, and this source is the Active Intellect. The relation of the latter to the elements and their compounds is the same as that of the Intelligences to their respective spheres: and our intellect in action, which originates in the Active Intellect, and enables us to comprehend that intellect, finds a parallel in the intellect of each of the spheres which originates in the Intelligence corresponding to that sphere, and enables the sphere to comprehend that Intelligence, to form an idea of it, and to move in seeking to become similar to it. Aristotle further infers, what has already been explained, that God does not act by means of direct contact. When, e.g., He destroys anything with fire, the fire is set in motion through the movement of the spheres, and the spheres by the Intelligences: the latter, which are identical with" the angels," and act by direct influence, are consequently, each in its turn, the cause of the motion of the spheres; as however, purely spiritual beings do not differ in their essence, and are by no means discrete quantities, he (Aristotle) came to the following conclusion: God created the first Intelligence, the motive agent of the first sphere; the Intelligence which causes the second sphere to move has its source and origin in the first Intelligence, and so on: the Intelligence which sets the sphere nearest to the earth in motion is the source and origin of the Active Intellect, the last in the series of purely spiritual beings. The series of material bodies similarly begins with the uppermost sphere, and ends with the elements and their compounds. The Intelligence which moves the uppermost sphere cannot be the Absolute Being, for there is an element common to all Intelligences, namely, the property of being the motive agent of a sphere, and there is another element by which each of them is distinguished from the rest; each of the ten Intelligences includes, therefore, two elements, and consequently another being must be the First Cause.
This is the theory, and opinion of Aristotle on these questions, and his proofs, where proof is possible, are given in various works of the Aristotelian school. In short, he believes that the spheres are animated and intellectual beings, capable of fully comprehending the principia of their existence: that there exist purely spiritual beings (Intelligences), which do not reside in corporeal objects, and which derive existence from God; and that these form the intermediate element between God and this material world.
In the chapters which follow I will show how far the teaching of Scripture is in harmony with these views, and how far it differs from them.
