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   We now consider the action of the angels on man, and inquire: (1) How 
far they can change them by their own natural power; (2) How they are 
sent by God to the ministry of men; (3) How they guard and protect men.
Under the first head there are four points of inquiry:
(1) Whether an angel can enlighten the human intellect?
(2) Whether he can change man's will?
(3) Whether he can change man's imagination?
(4) Whether he can change man's senses?
	
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  Objection 1: It would seem that an angel cannot enlighten man. For man is 
enlightened by faith; hence Dionysius (Eccl. Hier. iii) attributes 
enlightenment to baptism, as "the sacrament of faith." But faith is 
immediately from God, according to Eph. 2:8: "By grace you are saved 
through faith, and that not of yourselves, for it is the gift of God." 
Therefore man is not enlightened by an angel; but immediately by God.
  Objection 2: Further, on the words, "God hath manifested it to them" (@Rm. 1:19), the gloss observes that "not only natural reason availed for the 
manifestation of Divine truths to men, but God also revealed them by His 
work," that is, by His creature. But both are immediately from God---that 
is, natural reason and the creature. Therefore God enlightens man 
immediately.
  Objection 3: Further, whoever is enlightened is conscious of being 
enlightened. But man is not conscious of being enlightened by angels. 
Therefore he is not enlightened by them.
On the contrary, Dionysius says (Coel. Hier. iv) that the revelation of Divine things reaches men through the ministry of the angels. But such revelation is an enlightenment as we have stated (Question [106], Article [1]; Question [107], Article [2]). Therefore men are enlightened by the angels.
  I answer that, Since the order of Divine Providence disposes that lower 
things be subject to the actions of higher, as explained above (Question [109], Article [2]); as the inferior angels are enlightened by the superior, so men, 
who are inferior to the angels, are enlightened by them.
   The modes of each of these kinds of enlightenment are in one way alike 
and in another way unlike. For, as was shown above (Question [106], Article [1]), the 
enlightenment which consists in making known Divine truth has two 
functions; namely, according as the inferior intellect is strengthened by 
the action of the superior intellect, and according as the intelligible 
species which are in the superior intellect are proposed to the inferior 
so as to be grasped thereby. This takes place in the angels when the 
superior angel divides his universal concept of the truth according to 
the capacity of the inferior angel, as explained above (Question [106], Article [1]).
   The human intellect, however, cannot grasp the universal truth itself 
unveiled; because its nature requires it to understand by turning to the 
phantasms, as above explained (Question [84], Article [7]). So the angels propose the 
intelligible truth to men under the similitudes of sensible things, 
according to what Dionysius says (Coel. Hier. i), that, "It is impossible 
for the divine ray to shine on us, otherwise than shrouded by the variety 
of the sacred veils." On the other hand, the human intellect as the 
inferior, is strengthened by the action of the angelic intellect. And in 
these two ways man is enlightened by an angel.
  Reply to Objection 1: Two dispositions concur in the virtue of faith; first, the 
habit of the intellect whereby it is disposed to obey the will tending to 
Divine truth. For the intellect assents to the truth of faith, not as 
convinced by the reason, but as commanded by the will; hence Augustine 
says, "No one believes except willingly." In this respect faith comes 
from God alone. Secondly, faith requires that what is to be believed be 
proposed to the believer; which is accomplished by man, according to Rm. 
10:17, "Faith cometh by hearing"; principally, however, by the angels, by 
whom Divine things are revealed to men. Hence the angels have some part 
in the enlightenment of faith. Moreover, men are enlightened by the 
angels not only concerning what is to be believed; but also as regards 
what is to be done.
  Reply to Objection 2: Natural reason, which is immediately from God, can be 
strengthened by an angel, as we have said above. Again, the more the 
human intellect is strengthened, so much higher an intelligible truth can 
be elicited from the species derived from creatures. Thus man is assisted 
by an angel so that he may obtain from creatures a more perfect knowledge 
of God.
  Reply to Objection 3: Intellectual operation and enlightenment can be understood 
in two ways. First, on the part of the object understood; thus whoever 
understands or is enlightened, knows that he understands or is 
enlightened, because he knows that the object is made known to him. 
Secondly, on the part of the principle; and thus it does not follow that 
whoever understands a truth, knows what the intellect is, which is the 
principle of the intellectual operation. In like manner not everyone who 
is enlightened by an angel, knows that he is enlightened by him.
	
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  Objection 1: It would seem that the angels can change the will of man. For, 
upon the text, "Who maketh His angels spirits and His ministers a flame 
of fire" (@Heb. 1:7), the gloss notes that "they are fire, as being 
spiritually fervent, and as burning away our vices." This could not be, 
however, unless they changed the will. Therefore the angels can change 
the will.
  Objection 2: Further, Bede says (Super Matth. xv, 11), that, "the devil does 
not send wicked thoughts, but kindles them." Damascene, however, says 
that he also sends them; for he remarks that "every malicious act and 
unclean passion is contrived by the demons and put into men" (De Fide 
Orth. ii, 4); in like manner also the good angels introduce and kindle 
good thoughts. But this could only be if they changed the will. Therefore 
the will is changed by them.
  Objection 3: Further, the angel, as above explained, enlightens the human 
intellect by means of the phantasms. But as the imagination which serves 
the intellect can be changed by an angel, so can the sensitive appetite 
which serves the will, because it also is a faculty using a corporeal 
organ. Therefore as the angel enlightens the mind, so can he change the 
will.
  On the contrary, To change the will belongs to God alone, according to 
Prov. 21:1: "The heart of the king is in the hand of the Lord, 
whithersoever He will He shall turn it."
  I answer that, The will can be changed in two ways. First, from within; 
in which way, since the movement of the will is nothing but the 
inclination of the will to the thing willed, God alone can thus change 
the will, because He gives the power of such an inclination to the 
intellectual nature. For as the natural inclination is from God alone Who 
gives the nature, so the inclination of the will is from God alone, Who 
causes the will.
   Secondly, the will is moved from without. As regards an angel, this can 
be only in one way---by the good apprehended by the intellect. Hence in 
as far as anyone may be the cause why anything be apprehended as an 
appetible good, so far does he move the will. In this way also God alone 
can move the will efficaciously; but an angel and man move the will by 
way of persuasion, as above explained (Question [106], Article [2]).
   In addition to this mode the human will can be moved from without in 
another way; namely, by the passion residing in the sensitive appetite: 
thus by concupiscence or anger the will is inclined to will something. In 
this manner the angels, as being able to rouse these passions, can move 
the will, not however by necessity, for the will ever remains free to 
consent to, or to resist, the passion.
  Reply to Objection 1: Those who act as God's ministers, either men or angels, are 
said to burn away vices, and to incite to virtue by way  of persuasion.
  Reply to Objection 2: The demon cannot put thoughts in our minds by causing them 
from within, since the act of the cogitative faculty is subject to the 
will; nevertheless the devil is called the kindler of thoughts, inasmuch 
as he incites to thought, by the desire of the things thought of, by way 
of persuasion, or by rousing the passions. Damascene calls this kindling 
"a putting in" because such a work is accomplished within. But good 
thoughts are attributed to a higher principle, namely, God, though they 
may be procured by the ministry of the angels.
  Reply to Objection 3: The human intellect in its present state can understand 
only by turning to the phantasms; but the human will can will something 
following the judgment of reason rather than the passion of the sensitive 
appetite. Hence the comparison does not hold.
	
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  Objection 1: It would seem that an angel cannot change man's imagination. For 
the phantasy, as is said De Anima iii, is "a motion caused by the sense 
in act." But if this motion were caused by an angel, it would not be 
caused by the sense in act. Therefore it is contrary to the nature of the 
phantasy, which is the act of the imaginative faculty, to be changed by 
an angel.
  Objection 2: Further, since the forms in the imagination are spiritual, they 
are nobler than the forms existing in sensible matter. But an angel 
cannot impress forms upon sensible matter (Question [110], Article [2]). Therefore he 
cannot impress forms on the imagination, and so he cannot change it.
  Objection 3: Further, Augustine says (Gen. ad lit. xii, 12): "One spirit by 
intermingling with another can communicate his knowledge to the other 
spirit by these images, so that the latter either understands it himself, 
or accepts it as understood by the other." But it does not seem that an 
angel can be mingled with the human imagination, nor that the imagination 
can receive the knowledge of an angel. Therefore it seems that an angel 
cannot change the imagination.
  Objection 4: Further, in the imaginative vision man cleaves to the similitudes 
of the things as to the things themselves. But in this there is 
deception. So as a good angel cannot be the cause of deception, it seems 
that he cannot cause the imaginative vision, by changing the imagination.
On the contrary, Those things which are seen in dreams are seen by imaginative vision. But the angels reveal things in dreams, as appears from Mt. 1:20;[2]:13,[19] in regard to the angel who appeared to Joseph in dreams. Therefore an angel can move the imagination.
  I answer that, Both a good and a bad angel by their own natural power 
can move the human imagination. This may be explained as follows. For it 
was said above (Question [110], Article [3]), that corporeal nature obeys the angel as 
regards local movement, so that whatever can be caused by the local 
movement of bodies is subject to the natural power of the angels. Now it 
is manifest that imaginative apparitions are sometimes caused in us by 
the local movement of animal spirits and humors. Hence Aristotle says (De 
Somn. et Vigil.) [*De Insomniis iii.], when assigning the cause of 
visions in dreams, that "when an animal sleeps, the blood descends in 
abundance to the sensitive principle, and movements descend with it," 
that is, the impressions left from the movements are preserved in the 
animal spirits, "and move the sensitive principle"; so that a certain 
appearance ensues, as if the sensitive principle were being then changed 
by the external objects themselves. Indeed, the commotion of the spirits 
and humors may be so great that such appearances may even occur to those 
who are awake, as is seen in mad people, and the like. So, as this 
happens by a natural disturbance of the humors, and sometimes also by the 
will of man who voluntarily imagines what he previously experienced, so 
also the same may be done by the power of a good or a bad angel, 
sometimes with alienation from the bodily senses, sometimes without such 
alienation.
  Reply to Objection 1: The first principle of the imagination is from the sense in 
act. For we cannot imagine what we have never perceived by the senses, 
either wholly or partly; as a man born blind cannot imagine color. 
Sometimes, however, the imagination is informed in such a way that the 
act of the imaginative movement arises from the impressions preserved 
within.
  Reply to Objection 2: An angel changes the imagination, not indeed by the 
impression of an imaginative form in no way previously received from the 
senses (for he cannot make a man born blind imagine color), but by local 
movement of the spirits and humors, as above explained.
  Reply to Objection 3: The commingling of the angelic spirit with the human 
imagination is not a mingling of essences, but by reason of an effect 
which he produces in the imagination in the way above stated; so that he 
shows man what he [the angel] knows, but not in the way he knows.
  Reply to Objection 4: An angel causing an imaginative vision, sometimes 
enlightens the intellect at the same time, so that it knows what these 
images signify; and then there is not deception. But sometimes by the 
angelic operation the similitudes of things only appear in the 
imagination; but neither then is deception caused by the angel, but by 
the defect in the intellect to whom such things appear. Thus neither was 
Christ a cause of deception when He spoke many things to the people in 
parables, which He did not explain to them.
	
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  Objection 1: It seems that an angel cannot change the human senses. For the 
sensitive operation is a vital operation. But such an operation does not 
come from an extrinsic principle. Therefore the sensitive operation 
cannot be caused by an angel.
  Objection 2: Further, the sensitive operation is nobler than the nutritive. 
But the angel cannot change the nutritive power, nor other natural forms. 
Therefore neither can he change the sensitive power.
  Objection 3: Further, the senses are naturally moved by the sensible objects. 
But an angel cannot change the order of nature (Question [110], Article [4]). Therefore 
an angel cannot change the senses; but these are changed always by the 
sensible object.
  On the contrary, The angels who overturned Sodom, "struck the people of 
Sodom with blindness or {aorasia}, so that they could not find the door" 
(@Gn. 19:11). [*It is worth noting that these are the only two passages in 
the Greek version where the word {aorasia} appears. It expresses, in 
fact, the effect produced on the people of Sodom---namely, dazzling 
(French version, "eblouissement"), which the Latin "caecitas" (blindness) 
does not necessarily imply.] The same is recorded of the Syrians whom 
Eliseus led into Samaria (@4 Kgs. 6:18).
  I answer that, The senses may be changed in a twofold manner; from 
without, as when affected by the sensible object: and from within, for we 
see that the senses are changed when the spirits and humors are 
disturbed; as for example, a sick man's tongue, charged with choleric 
humor, tastes everything as bitter, and the like with the other senses. 
Now an angel, by his natural power, can work a change in the senses both 
ways. For an angel can offer the senses a sensible object from without, 
formed by nature or by the angel himself, as when he assumes a body, as 
we have said above (Question [51], Article [2]). Likewise he can move the spirits and 
humors from within, as above remarked, whereby the senses are changed in 
various ways.
  Reply to Objection 1: The principle of the sensitive operation cannot be without 
the interior principle which is the sensitive power; but this interior 
principle can be moved in many ways by the exterior principle, as above 
explained.
  Reply to Objection 2: By the interior movement of the spirits and humors an angel 
can do something towards changing the act of the nutritive power, and 
also of the appetitive and sensitive power, and of any other power using 
a corporeal organ.
  Reply to Objection 3: An angel can do nothing outside the entire order of 
creatures; but he can outside some particular order of nature, since he 
is not subject to that order; thus in some special way an angel can work 
a change in the senses outside the common mode of  nature.