Besides, the sense of sight, or the faculty of vision, is a passive faculty, and every passive faculty is set in motion by the active agent that corresponds to it. Now the active agent corresponding to sight is twofold: one is the origin of the act, or the object; the other is the carrier, or medium. But that apparent shape cannot be the object of the sense, neither can it be the medium through which it is carried. First, it cannot be the object, since it cannot be taken hold of by anything, as was shown in the foregoing argument, since it does not exist in the senses received from an object, neither is it in the actual object, nor even in the air, as in a carrying medium, as was treated of above in the third argument.
Besides, if the devil moves the inner consciousness, he does so either by projecting himself into the cognitive faculty, or by changing it. But he does not do so by projecting himself; for he would either have to assume a body, and even so could not penetrate into the inner organ of imagination; for two bodies cannot be at the same time in the same place; or he would assume a phantasmal body; and this again would be impossible, since no phantasm is quite without substance.
Similarly also he cannot do it by changing the cognition. For he would either change it by alteration, which he does not seem able to do, since all alteration is caused by active qualities, in which the devils are lacking; or he would change it by transformation or local motion; and this does not seem feasible for two reasons. First, because a transformation of an organ cannot be effected without a sense of pain. Secondly, because in this case the devil would only make things of a known shape appear; but S. Augustine says that he creates shapes of this sort, both known and unknown. Therefore it seems that the devils can in no way deceive the imagination or senses of a man.
But against this, S. Augustine says (De Ciuitate Dei, XVIII) that the transmutations of men into brute animals, said to be done by the art of devils, are not actual but only apparent. But this would not be possible if devils were not able to transmute the human senses. The authority of S. Augustine is again to the point in Book LXXXIII, which has already been quoted: This evil of the devil creeps in through all the sensual approaches, etc.
Answer. If the reader wishes to refer to the method of transmutation, he will find in the Second Part of this work, chapter VI, various methods. But proceeding for the present in a scholastic manner, let us say in agreement with the opinions of the three Doctors, that the devil can deceive the human fancy so that a man really seems to be an animal. The last of those opinions, which is that of S. Thomas, is more subtle than the rest. But the first is that of S. Antoninus154 in the first part of his Summa, V, 5, where he declares that the devil at times works to deceive a man’s fancy, especially by an illusion of the senses; and he proves this by natural reasoning, by the authority of the Canon, and by a great number of examples.
And at first as follows: Our bodies naturally are subject to and obey the angelic nature as regards local motion. But the bad angels, although the have lost grace, have not lost their natural power, as has often been said before. And since the faculty of fancy or imagination is corporeal, that is, allied to a physical organ, it also is naturally subject to devils, so that they can transmute it, causing various fantasies, by the flow of the thoughts and perceptions to the original image received by them. So says S. Antoninus, and adds that it is proved by the following Canon (Episcopus, XXVI, 5): It must not be omitted that certain wicked women, perverted by Satan and seduced by the illusions and phantasms of devils, believe and profess that they ride in the night hours on certain beasts with Diana, the heathen goddess, or with Herodias, and with a countless number of women, and that in the untimely silence of night they travel over great distances of land. And later: Wherefore priests ought to preach to the people of God that they should know this to be altogether false, and that when such phantasms afflict the minds of the faithful, it is not of God, but of an evil spirit. For Satan himself transforms himself into the shape and likeness of different persons, and in dreams deluding the mind which he holds captive, leads it through devious ways.
Indeed the meaning of this Canon has been treated of in the First Question, as to the four things which are to be preached. But it would be to misunderstand its meaning to maintain that witches cannot be so transported, when they wish and God does not prevent it; for very often men who are not witches are unwillingly transported bodily over great distances of land.
But that these transmutations can be effected in both ways will be shown by the aforesaid Summa, and in the chapter where S. Augustine relates that it is read in the books of the Gentiles that a certain sorceress named Circe changed the companions of Ulysses into beasts; but that this was due to some glamour or illusion, rather than an actual accomplishment, by
