Reply Obj. 1: Corporeal things have determinate actions; but they exercise such actions only according as they are moved; because it belongs to a body not to act unless moved. Hence a corporeal creature must be moved by a spiritual creature.
Reply Obj. 2: The reason alleged is according to the opinion of Aristotle who laid down (Metaph. xi, 8) that the heavenly bodies are moved by spiritual substances; the number of which he endeavored to assign according to the number of motions apparent in the heavenly bodies. But he did not say that there were any spiritual substances with immediate rule over the inferior bodies, except perhaps human souls; and this was because he did not consider that any operations were exercised in the inferior bodies except the natural ones for which the movement of the heavenly bodies sufficed. But because we assert that many things are done in the inferior bodies besides the natural corporeal actions, for which the movements of the heavenly bodies are not sufficient; therefore in our opinion we must assert that the angels possess an immediate presidency not only over the heavenly bodies, but also over the inferior bodies.
Reply Obj. 3: Philosophers have held different opinions about immaterial substances. For Plato laid down that immaterial substances were types and species of sensible bodies; and that some were more universal than others; and so he held that immaterial substances preside immediately over all sensible bodies, and different ones over different bodies. But Aristotle held that immaterial substances are not the species of sensible bodies, but something higher and more universal; and so he did not attribute to them any immediate presiding over single bodies, but only over the universal agents, the heavenly bodies. Avicenna followed a middle course. For he agreed with Plato in supposing some spiritual substance to preside immediately in the sphere of active and passive elements; because, as Plato also said, he held that the forms of these sensible things are derived from immaterial substances. But he differed from Plato because he supposed only one immaterial substance to preside over all inferior bodies, which he called the "active intelligence."
The holy doctors held with the Platonists that different spiritual substances were placed over corporeal things. For Augustine says (QQ. 83, qu. 79): "Every visible thing in this world has an angelic power placed over it"; and Damascene says (De Fide Orth. ii, 4): "The devil was one of the angelic powers who presided over the terrestrial order"; and Origen says on the text, "When the ass saw the angel" (Num. 22:23), that "the world has need of angels who preside over beasts, and over the birth of animals, and trees, and plants, and over the increase of all other things" (Hom. xiv in Num.). The reason of this, however, is not that an angel is more fitted by his nature to preside over animals than over plants; because each angel, even the least, has a higher and more universal power than any kind of corporeal things: the reason is to be sought in the order of Divine wisdom, Who places different rulers over different things. Nor does it follow that there are more than nine orders of angels, because, as above expounded (Q. 108, A. 2), the orders are distinguished by their general offices. Hence as according to Gregory all the angels whose proper office it is to preside over the demons are of the order of the "powers"; so to the order of the "virtues" do those angels seem to belong who preside over purely corporeal creatures; for by their ministration miracles are sometimes performed. _______________________
SECOND ARTICLE [I, Q. 110, Art. 2]
Whether Corporeal Matter Obeys the Mere Will of an Angel?
Objection 1: It would seem that corporeal matter obeys the mere will of an angel. For the power of an angel excels the power of the soul. But corporeal matter obeys a conception of the soul; for the body of man is changed by a conception of the soul as regards heat and cold, and sometimes even as regards health and sickness. Therefore much more is corporeal matter changed by a conception of an angel.
Obj. 2: Further, whatever can be done by an inferior power, can be done by a superior power. Now the power of an angel is superior to corporeal power. But a body by its power is able to transform corporeal matter; as appears when fire begets fire. Therefore much more efficaciously can an angel by his power transform corporeal matter.
Obj. 3: Further, all corporeal nature is under angelic administration, as appears above (A. 1), and thus it appears that bodies are as instruments to the angels, for an instrument is essentially a mover moved. Now in effects there is something that is due to the power of their principal agents, and which cannot be due to the power of the instrument; and this it is that takes the principal place in the effect. For example, digestion is due to the force of natural heat, which is the instrument of the nutritive soul: but that living flesh is thus generated is due to the power of the soul. Again the cutting of the wood is from the saw; but that it assumes the length the form of a bed is from the design of the [joiner's] art. Therefore the substantial form which takes the principal place in the corporeal effects, is due to the angelic power. Therefore matter obeys the angels in receiving its form.
On the contrary, Augustine says "It is not to be thought, that this visible matter obeys these rebel angels; for it obeys God alone."