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   We now consider the assaults of the demons. Under this head there are 
five points of inquiry:
(1) Whether men are assailed by the demons?
(2) Whether to tempt is proper to the devil?
    (3) Whether all the sins of men are to be set down to the assaults or 
temptations of the demons?
    (4) Whether they can work real miracles for the purpose of leading men 
astray?
    (5) Whether the demons who are overcome by men, are hindered from making 
further assaults?
	
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  Objection 1: It would seem that men are not assailed by the demons. For angels 
are sent by God to guard man. But demons are not sent by God: for the 
demons' intention is the loss of souls; whereas God's is the salvation of 
souls. Therefore demons are not deputed to assail man.
  Objection 2: Further, it is not a fair fight, for the weak to be set against 
the strong, and the ignorant against the astute. But men are weak and 
ignorant, whereas the demons are strong and astute. It is not therefore 
to be permitted by God, the author of all justice, that men should be 
assailed by demons.
  Objection 3: Further, the assaults of the flesh and the world are enough for 
man's exercise. But God permits His elect to be assailed that they may be 
exercised. Therefore there is no need for them to be assailed by the 
demons.
  On the contrary, The Apostle says (@Eph. 6:12): "Our wrestling is not 
against flesh and blood; but against Principalities and Powers, against 
the rulers of the world of this darkness, against the spirits of 
wickedness in the high places."
  I answer that, Two things may be considered in the assault of the 
demons---the assault itself, and the ordering thereof. The assault itself 
is due to the malice of the demons, who through envy endeavor to hinder 
man's progress; and through pride usurp a semblance of Divine power, by 
deputing certain ministers to assail man, as the angels of God in their 
various offices minister to man's salvation. But the ordering of the 
assault is from God, Who knows how to make orderly use of evil by 
ordering it to good. On the other hand, in regard to the angels, both 
their guardianship and the ordering thereof are to be referred to God as 
their first author.
  Reply to Objection 1: The wicked angels assail men in two ways. Firstly by 
instigating them to sin; and thus they are not sent by God to assail us, 
but are sometimes permitted to do so according to God's just judgments. 
But sometimes their assault is a punishment to man: and thus they are 
sent by God; as the lying spirit was sent to punish Achab, King of 
Israel, as is related in 3 Kgs. 22:20. For  punishment is referred to God 
as its first author. Nevertheless the demons who are sent to punish, do 
so with an intention other than that for which they are sent; for they 
punish from hatred or envy; whereas they are sent by God on account of 
His justice.
  Reply to Objection 2: In order that the conditions of the fight be not unequal, 
there is as regards man the promised recompense, to be gained principally 
through the grace of God, secondarily through the guardianship of the 
angels. Wherefore (@4 Kgs. 6:16), Eliseus said to his servant: "Fear not, 
for there are more with us than with them."
  Reply to Objection 3: The assault of the flesh and the world would suffice for 
the exercise of human weakness: but it does not suffice for the demon's 
malice, which makes use of both the above in assailing men. But by the 
Divine ordinance this tends to the glory of the elect.
	
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  Objection 1: It would seem that to tempt is not proper to the devil. For God 
is said to tempt, according to Gn. 22:1, "God tempted Abraham." Moreover 
man is tempted by the flesh and the world. Again, man is said to tempt 
God, and to tempt man. Therefore it is not proper to the devil to tempt.
  Objection 2: Further, to tempt is a sign of ignorance. But the demons know 
what happens among men. Therefore the demons do not tempt.
  Objection 3: Further, temptation is the road to sin. Now sin dwells in the 
will. Since therefore the demons cannot change man's will, as appears 
from what has been said above (Question [111], Article [2]), it seems that it is not in 
their province to tempt.
  On the contrary, It is written (@1 Thess. 3:5): "Lest perhaps he that 
tempteth should have tempted you": to which the gloss adds, "that is, the 
devil, whose office it is to tempt."
  I answer that, To tempt is, properly speaking, to make trial of 
something. Now we make trial of something in order to know something 
about it: hence the immediate end of every tempter is knowledge. But 
sometimes another end, either good or bad, is sought to be acquired 
through that knowledge; a good end, when, for instance, one desires to 
know of someone, what sort of a man he is as to knowledge, or virtue, 
with a view to his promotion; a bad end, when that knowledge is sought 
with the purpose of deceiving or ruining him.
   From this we can gather how various beings are said to tempt in various 
ways. For man is said to tempt, sometimes indeed merely for the sake of 
knowing something; and for this reason it is a sin to tempt God; for man, 
being uncertain as it were, presumes to make  an experiment of God's 
power. Sometimes too he tempts in order to help, sometimes in order to 
hurt. The devil, however, always tempts in order to hurt by urging man 
into sin. In this sense it is said to be his proper office to tempt: for 
thought at times man tempts thus, he does this as minister of the devil. 
God is said to tempt that He may know, in the same sense as that is said 
to know which makes others to know. Hence it is written (@Dt. 13:3): "The 
Lord your God trieth you, that it may appear whether you love him."
   The flesh and the world are said to tempt as the instruments or matter 
of temptations; inasmuch as one can know what sort of man someone is, 
according as he follows or resists the desires of the flesh, and 
according as he despises worldly advantages and adversity: of which 
things the devil also makes use in tempting.
Thus the reply to the first objection is clear.
  Reply to Objection 2: The demons know what happens outwardly among men; but the 
inward disposition of man God alone knows, Who is the "weigher of 
spirits" (@Prov. 16:2). It is this disposition that makes man more prone 
to one vice than to another: hence the devil tempts, in order to explore 
this inward disposition of man, so that he may tempt him to that vice to 
which he is most prone.
  Reply to Objection 3: Although a demon cannot change the will, yet, as stated 
above (Question [111], Article [3]), he can change the inferior powers of man, in a 
certain degree: by which powers, though the will cannot be forced, it can 
nevertheless be inclined.
	
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  Objection 1: It would seem that all sins are due to the temptation of the 
devil. For Dionysius says (Div. Nom. iv) that "the multitude of demons is 
the cause of all evils, both to themselves and to others." And Damascene 
says (De Fide Orth. ii, 4) that "all malice and all uncleanness have been 
devised by the devil."
  Objection 2: Further, of every sinner can be said what the Lord said of the 
Jews (@Jn. 8:44): "You are of your father the devil." But this was in as 
far as they sinned through the devil's instigation. Therefore every sin 
is due to the devil's instigation.
  Objection 3: Further, as angels are deputed to guard men, so demons are 
deputed to assail men. But every good thing we do is due to the 
suggestion of the good angels: because the Divine gifts are borne to us 
by the angels. Therefore all the evil we do, is due to the instigation of 
the devil.
  On the contrary, It is written (De Eccl. Dogmat. xlix): "Not all our 
evil thoughts are stirred up by the devil, but sometimes they arise from 
the movement of our free-will."
  I answer that, One thing can be the cause of another in two  ways; 
directly and indirectly. Indirectly as when an agent is the cause of a 
disposition to a certain effect, it is said to be the occasional and 
indirect cause of that effect: for instance, we might say that he who 
dries the wood is the cause of the wood burning. In this way we must 
admit that the devil is the cause of all our sins; because he it was who 
instigated the first man to sin, from whose sin there resulted a 
proneness to sin in the whole human race: and in this sense we must take 
the words of Damascene and Dionysius.
   But a thing is said to be the direct cause of something, when its action 
tends directly thereunto. And in this way the devil is not the cause of 
every sin: for all sins are not committed at the devil's instigation, but 
some are due to the free-will and the corruption of the flesh. For, as 
Origen says (Peri Archon iii), even if there were no devil, men would 
have the desire for food and love and such like pleasures; with regard to 
which many disorders may arise unless those desires are curbed by reason, 
especially if we presuppose the corruption of our natures. Now it is in 
the power of the free-will to curb this appetite and keep it in order. 
Consequently there is no need for all sins to be due to the instigation 
of the devil. But those sins which are due thereto man perpetrates 
"through being deceived by the same blandishments as were our first 
parents," as Isidore says (De Summo Bono ii).
Thus the answer to the first objection is clear.
  Reply to Objection 2: When man commits sin without being thereto instigated by 
the devil, he nevertheless becomes a child of the devil thereby, in so 
far as he imitates him who was the first to sin.
  Reply to Objection 3: Man can of his own accord fall into sin: but he cannot 
advance in merit without the Divine assistance, which is borne to man by 
the ministry of the angels. For this reason the angels take part in all 
our good works: whereas all our sins are not due to the demons' 
instigation. Nevertheless there is no kind of sin which is not sometimes 
due to the demons' suggestion.
	
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  Objection 1: It would seem that the demons cannot lead men astray by means of 
real miracles. For the activity of the demons will show itself especially 
in the works of Antichrist. But as the Apostle says (@2 Thess. 2:9), his 
"coming is according to the working of Satan, in all power, and signs, 
and lying wonders." Much more therefore at other times do the demons 
perform lying wonders.
Objection 2: Further, true miracles are wrought by some corporeal change. But demons are unable to change the nature of a body; for Augustine says (De Civ. Dei xviii, 18): "I cannot believe that the human body can receive the limbs of a beast by means of a demon's art or power." Therefore the demons cannot work real miracles.
  Objection 3: Further, an argument is useless which may prove both ways. If 
therefore real miracles can be wrought by demons, to persuade one of what 
is false, they will be useless to confirm the teaching of the faith. This 
is unfitting; for it is written (Mk. 16:20): "The Lord working withal, 
and confirming the word with signs that followed."
  On the contrary, Augustine says (Question [83]; [*Lib. xxi, Sent. sent 4, among the supposititious works of St. Augustine]): "Often by means of the magic 
art miracles are wrought like those which are wrought by the servants of 
God."
  I answer that, As is clear from what has been said above (Question [110], Article [4]), 
if we take a miracle in the strict sense, the demons cannot work 
miracles, nor can any creature, but God alone: since in the strict sense 
a miracle is something done outside the order of the entire created 
nature, under which order every power of a creature is contained. But 
sometimes miracle may be taken in a wide sense, for whatever exceeds the 
human power and experience. And thus demons can work miracles, that is, 
things which rouse man's astonishment, by reason of their being beyond 
his power and outside his sphere of knowledge. For even a man by doing 
what is beyond the power and knowledge of another, leads him to marvel at 
what he has done, so that in a way he seems to that man to have worked a 
miracle.
   It is to be noted, however, that although these works of demons which 
appear marvelous to us are not real miracles, they are sometimes 
nevertheless something real. Thus the magicians of Pharaoh by the demons' 
power produced real serpents and frogs. And "when fire came down from 
heaven and at one blow consumed Job's servants and sheep; when the storm 
struck down his house and with it his children---these were the work of 
Satan, not phantoms"; as Augustine says (De Civ. Dei xx, 19).
  Reply to Objection 1: As Augustine says in the same place, the works of 
Antichrist may be called lying wonders, "either because he will deceive 
men's senses by means of phantoms, so that he will not really do what he 
will seem to do; or because, if he work real prodigies, they will lead 
those into falsehood who believe in him."
  Reply to Objection 2: As we have said above (Question [110], Article [2]), corporeal matter does 
not obey either good or bad angels at their will, so that demons be able 
by their power to transmute matter from one form to another; but they can 
employ certain seeds that exist in the elements of the world, in order to 
produce these effects, as Augustine says (De Trin. iii, 8,9). Therefore 
it must be admitted that all the transformation of corporeal things which 
can be produced by certain natural powers, to which we must assign the 
seeds above mentioned, can alike be produced by the operation of the 
demons, by the employment of these seeds; such as the transformation of 
certain things into serpents or frogs, which can be produced by 
putrefaction. On the contrary, those transformations  which cannot be 
produced by the power of nature, cannot in reality be effected by the 
operation of the demons; for instance, that the human body be changed 
into the body of a beast, or that the body of a dead man return to life. 
And if at times something of this sort seems to be effected by the 
operation of demons, it is not real but a mere semblance of reality.
   Now this may happen in two ways. Firstly, from within; in this way a 
demon can work on man's imagination and even on his corporeal senses, so 
that something seems otherwise that it is, as explained above (Question [111], Articles [3],4). It is said indeed that this can be done sometimes by the power 
of certain bodies. Secondly, from without: for just as he can from the 
air form a body of any form and shape, and assume it so as to appear in 
it visibly: so, in the same way he can clothe any corporeal thing with 
any corporeal form, so as to appear therein. This is what Augustine says 
(De Civ. Dei xviii, 18): "Man's imagination, which whether thinking or 
dreaming, takes the forms of an innumerable number of things, appears to 
other men's senses, as it were embodied in the semblance of some animal." 
This not to be understood as though the imagination itself or the images 
formed therein were identified with that which appears embodied to the 
senses of another man: but that the demon, who forms an image in a man's 
imagination, can offer the same picture to another man's senses.
  Reply to Objection 3: As Augustine says (Questions. 83, qu. 79): "When magicians do what 
holy men do, they do it for a different end and by a different right. The 
former do it for their own glory; the latter, for the glory of God: the 
former, by certain private compacts; the latter by the evident assistance 
and command of God, to Whom every creature is subject."
	
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  Objection 1: It would seem that a demon who is overcome by a man, is not for 
that reason hindered from any further assault. For Christ overcame the 
tempter most effectively. Yet afterwards the demon assailed Him by 
instigating the Jews to kill Him. Therefore it is not true that the devil 
when conquered ceases his assaults.
  Objection 2: Further, to inflict punishment on one who has been worsted in a 
fight, is to incite him to a sharper attack. But this is not befitting 
God's mercy. Therefore the conquered demons are not prevented from 
further assaults.
  On the contrary, It is written (@Mt. 4:11): "Then the devil left Him," 
i.e. Christ Who overcame.
  I answer that, Some say that when once a demon has been overcome he can 
no more tempt any man at all, neither to the same nor to any other sin. 
And others say that he can tempt others, but not the same man. This seems 
more probable as long as we understand  it to be so for a certain 
definite time: wherefore (@Lk. 4:13) it is written: "All temptation being 
ended, the devil departed from Him for a time." There are two reasons for 
this. One is on the part of God's clemency; for as Chrysostom says (Super 
Matt. Hom. v) [*In the Opus Imperfectum, among his supposititious works], 
"the devil does not tempt man for just as long as he likes, but for as 
long as God allows; for although He allows him to tempt for a short time, 
He orders him off on account of our weakness." The other reason is taken 
from the astuteness of the devil. As to this, Ambrose says on Lk. 4:13: 
"The devil is afraid of persisting, because he shrinks from frequent 
defeat." That the devil does nevertheless sometimes return to the 
assault, is apparent from Mt. 12:44: "I will return into my house from 
whence I came out."
From what has been said, the objections can easily be solved.