Similarly in another way. If the immediate mover of the substance is infinite, the motion of the substance is infinite. But it is impossible for the motion of the substance to be infinite, since its substance is finite. Therefore it is impossible for the immediate mover of this substance to be infinite. Next we shall add to this conclusion the following proposition: The First Author is infinite. Therefore it is impossible for the First Author to be the immediate mover of the substance.
The motion of the substance that supports the categories cannot but be either natural or voluntary. If it is natural, the First Author is not its immediate mover, for the First Author does not cause a natural effect without an intermediary. And if it is voluntary, and the substance in itself has no will, it is necessary for the substance to depend on another substance, that gives it a will to move. Now it is impossible that this substance should be the First Author, for the First Author is not mobile. Therefore this substance that gives motion to the substance that supports the categories is different from the First Author. Therefore the First Author is not the immediate mover of the substance.
The substance that moves the substance supporting the categories must be either mobile or immobile. If it is immobile, it cannot move the substance that supports the categories, for this substance either can move or cannot. If it can move, it would be mobile. If it cannot move in itself, it could not possibly move another thing.
The proof of the impossibility for the mover of the substance to be able to move it, since it cannot