Summa Th. II-II EN Qu.162
We must next consider pride, and (1) pride in general; (2) the first man's sin, which we hold to have been pride. Under the first head there are eight points of inquiry:
(1) Whether pride is a sin?
(2) Whether it is a special vice?
(3) Wherein does it reside as in its subject?
(4) Of its species;
(5) Whether it is a mortal sin?
(6) Whether it is the most grievous of all sins?
(7) Of its relation to other sins;
(8) Whether it should be reckoned a capital vice?
Objection: 1. It would seem that pride is not a sin. For no sin is the object of God's promise. For God's promises refer to what He will do; and He is not the author of sin. Now pride is numbered among the Divine promises: for it is written (Is 60,15): "I will make thee to be an everlasting pride [Douay: 'glory'], a joy unto generation and generation." Therefore pride is not a sin.
2. Further, it is not a sin to wish to be like unto God: for every creature has a natural desire for this; and especially does this become the rational creature which is made to God's image and likeness. Now it is said in Prosper's Lib. Sent. 294, that "pride is love of one's own excellence, whereby one is likened to God who is supremely excellent." Hence Augustine says (Confess. ii, 6): "Pride imitates exaltedness; whereas Thou alone art God exalted over all." Therefore pride is not a sin.
3. Further, a sin is opposed not only to a virtue but also to a contrary vice, as the Philosopher states (Ethic. ii, 8). But no vice is found to be opposed to pride. Therefore pride is not a sin.
On the contrary It is written (Tb 4,14): "Never suffer pride to reign in thy mind or in thy words."
I answer that Pride [superbia] is so called because a man thereby aims higher [supra] than he is; wherefore Isidore says (Etym. x): "A man is said to be proud, because he wishes to appear above (super) what he really is"; for he who wishes to overstep beyond what he is, is proud. Now right reason requires that every man's will should tend to that which is proportionate to him. Therefore it is evident that pride denotes something opposed to right reason, and this shows it to have the character of sin, because according to Dionysius (Div. Nom. iv, 4), "the soul's evil is to be opposed to reason." Therefore it is evident that pride is a sin.
Reply to Objection: 1. Pride [superbia] may be understood in two ways. First, as overpassing [supergreditur] the rule of reason, and in this sense we say that it is a sin. Secondly, it may simply denominate "super-abundance"; in which sense any super-abundant thing may be called pride: and it is thus that God promises pride as significant of super-abundant good. Hence a gloss of Jerome on the same passage (Is 61,6) says that "there is a good and an evil pride"; or "a sinful pride which God resists, and a pride that denotes the glory which He bestows."It may also be replied that pride there signifies abundance of those things in which men may take pride.
2. Reason has the direction of those things for which man has a natural appetite; so that if the appetite wander from the rule of reason, whether by excess or by default, it will be sinful, as is the case with the appetite for food which man desires naturally. Now pride is the appetite for excellence in excess of right reason. Wherefore Augustine says (De Civ. Dei xiv, 13) that pride is the "desire for inordinate exaltation": and hence it is that, as he asserts (De Civ. Dei xiv, 13; xix, 12), "pride imitates God inordinately: for it hath equality of fellowship under Him, and wishes to usurp Hi. dominion over our fellow-creatures."
3. Pride is directly opposed to the virtue of humility, which, in a way, is concerned about the same matter as magnanimity, as stated above (Question , Article , ad 3). Hence the vice opposed to pride by default is akin to the vice of pusillanimity, which is opposed by default to magnanimity. For just as it belongs to magnanimity to urge the mind to great things against despair, so it belongs to humility to withdraw the mind from the inordinate desire of great things against presumption. Now pusillanimity, if we take it for a deficiency in pursuing great things, is properly opposed to magnanimity by default; but if we take it for the mind's attachment to things beneath what is becoming to a man, it is opposed to humility by default; since each proceeds from a smallness of mind. In the same way, on the other hand, pride may be opposed by excess, both to magnanimity and humility, from different points of view: to humility, inasmuch as it scorns subjection, to magnanimity, inasmuch as it tends to great things inordinately. Since, however, pride implies a certain elation, it is more directly opposed to humility, even as pusillanimity, which denotes littleness of soul in tending towards great things, is more directly opposed to magnanimity.
Objection: 1. It would seem that pride is not a special sin. For Augustine says (De Nat. et Grat. xxix) that "you will find no sin that is not labelled pride"; and Prosper says (De Vita Contempl. iii, 2) that "without pride no sin is, or was, or ever will be possible." Therefore pride is a general sin.
2. Further, a gloss on Jb 33,17, "That He may withdraw man from wickedness [*Vulg.: 'From the things that he is doing, and may deliver him from pride']," says that "a man prides himself when he transgresses His commandments by sin." Now according to Ambrose [*De Parad. viii], "every sin is a transgression of the Divine law, and a disobedience of the heavenly commandments." Therefore every sin is pride.
3. Further, every special sin is opposed to a special virtue. But pride is opposed to all the virtues, for Gregory says (Moral. xxxiv, 23): "Pride is by no means content with the destruction of one virtue; it raises itself up against all the powers of the soul, and like an all-pervading and poisonous disease corrupts the whole body"; and Isidore says (Etym. [*De Summo Bono ii, 38]) that it is "the downfall of all virtues." Therefore pride is not a special sin.
4. Further, every special sin has a special matter. Now pride has a general matter, for Gregory says (Moral. xxxiv, 23) that "one man is proud of his gold, another of his eloquence: one is elated by mean and earthly things, another by sublime and heavenly virtues." Therefore pride is not a special but a general sin.
On the contrary Augustine says (De Nat. et Grat. xxix): "If he look into the question carefully, he will find that, according to God's law, pride is a very different sin from other vices." Now the genus is not different from its species. Therefore pride is not a general but a special sin.
I answer that The sin of pride may be considered in two ways. First with regard to its proper species, which it has under the aspect of its proper object. In this way pride is a special sin, because it has a special object: for it is inordinate desire of one's own excellence, as stated (Article , ad 2). Secondly, it may be considered as having a certain influence towards other sins. In this way it has somewhat of a generic character, inasmuch as all sins may arise from pride, in two ways. First directly, through other sins being directed to the end of pride which is one's own excellence, to which may be directed anything that is inordinately desired. Secondly, indirectly and accidentally as it were, that is by removing an obstacle, since pride makes a man despise the Divine law which hinders him from sinning, according to Jr 2,20, "Thou hast broken My yoke, thou hast burst My bands, and thou saidst: I will not serve."It must, however, be observed that this generic character of pride admits of the possibility of all vices arising from pride sometimes, but it does not imply that all vices originate from pride always. For though one may break the commandments of the Law by any kind of sin, through contempt which pertains to pride, yet one does not always break the Divine commandments through contempt, but sometimes through ignorance. and sometimes through weakness: and for this reason Augustine says (De Nat. et Grat. xxix) that "many things are done amiss which are not done through pride."
Reply to Objection: 1. These words are introduced by Augustine into his book De Nat. et Grat., not as being his own, but as those of someone with whom he is arguing. Hence he subsequently disproves the assertion, and shows that not all sins are committed through pride. We might, however, reply that these authorities must be understood as referring to the outward effect of pride, namely the breaking of the commandments, which applies to every sin, and not to the inward act of pride, namely contempt of the commandment. For sin is committed, not always through contempt, but sometimes through ignorance, sometimes through weakness, as stated above.
2. A man may sometimes commit a sin effectively, but not affectively; thus he who, in ignorance, slays his father, is a parricide effectively, but not affectively, since he did not intend it. Accordingly he who breaks God's commandment is said to pride himself against God, effectively always, but not always affectively.
3. A sin may destroy a virtue in two ways. In one way by direct contrariety to a virtue, and thus pride does not corrupt every virtue, but only humility; even as every special sin destroys the special virtue opposed to it, by acting counter thereto. In another way a sin destroys a virtue, by making ill use of that virtue: and thus pride destroys every virtue, in so far as it finds an occasion of pride in every virtue, just as in everything else pertaining to excellence. Hence it does not follow that it is a general sin.
4. Pride regards a special aspect in its object, which aspect may be found in various matters: for it is inordinate love of one's excellence, and excellence may be found in various things.
Objection: 1. It would seem that the subject of pride is not the irascible faculty. For Gregory says (Moral. xxiii, 17): "A swollen mind is an obstacle to truth, for the swelling shuts out the light." Now the knowledge of truth pertains, not to the irascible but to the rational faculty. Therefore pride is not in the irascible.
2. Further, Gregory says (Moral. xxiv, 8) that "the proud observe other people's conduct not so as to set themselves beneath them with humility, but so as to set themselves above them with pride": wherefore it would seem that pride originates in undue observation. Now observation pertains not to the irascible but to the rational faculty.
3. Further. pride seeks pre-eminence not only in sensible things, but also in spiritual and intelligible things: while it consists essentially in the contempt of God, according to Si 10,14, "The beginning of the pride of man is to fall off from God." Now the irascible, since it is a part of the sensitive appetite, cannot extend to God and things intelligible. Therefore pride cannot be in the irascible.
4. Further, as stated in Prosper's Liber Sententiarum, sent. 294, "Pride is love of one's own excellence." But love is not in the irascible, but in the concupiscible. Therefore pride is not in the irascible.
On the contrary Gregory (Moral. ii, 49) opposes pride to the gift of fear. Now fear belongs to the irascible. Therefore pride is in the irascible.
I answer that The subject of any virtue or vice is to be ascertained from its proper object: for the object of a habit or act cannot be other than the object of the power, which is the subject of both. Now the proper object of pride is something difficult, for pride is the desire of one's own excellence, as stated above (Articles ,2). Wherefore pride must needs pertain in some way to the irascible faculty. Now the irascible may be taken in two ways. First in a strict sense, and thus it is a part of the sensitive appetite, even as anger, strictly speaking, is a passion of the sensitive appetite. Secondly, the irascible may be taken in a broader sense, so as to belong also to the intellective appetite, to which also anger is sometimes ascribed. It is thus that we attribute anger to God and the angels, not as a passion, but as denoting the sentence of justice pronouncing judgment. Nevertheless the irascible understood in this broad sense is not distinct from the concupiscible power, as stated above in the I 59,4; I-II 82,5, ad 1 and 2.Consequently if the difficult thing which is the object of pride, were merely some sensible object, whereto the sensitive appetite might tend, pride would have to be in the irascible which is part of the sensitive appetite. But since the difficult thing which pride has in view is common both to sensible and to spiritual things, we must needs say that the subject of pride is the irascible not only strictly so called, as a part of the sensitive appetite, but also in its wider acceptation, as applicable to the intellective appetite. Wherefore pride is ascribed also to the demons.
Reply to Objection: 1. Knowledge of truth is twofold. One is purely speculative, and pride hinders this indirectly by removing its cause. For the proud man subjects not his intellect to God, that he may receive the knowledge of truth from Him, according to Mt 11,25, "Thou hast hid these things from the wise and the prudent," i.e. from the proud, who are wise and prudent in their own eyes, "and hast revealed them to little ones," i.e. to the humble.Nor does he deign to learn anything from man, whereas it is written (Si 6,34): "If thou wilt incline thy ear, thou shalt receive instruction." The other knowledge of truth is affective, and this is directly hindered by pride, because the proud, through delighting in their own excellence, disdain the excellence of truth; thus Gregory says (Moral. xxiii, 17) that "the proud, although certain hidden truths be conveyed to their understanding, cannot realize their sweetness: and if they know of them they cannot relish them." Hence it is written (Pr 11,2): "Where humility is there also is wisdom."
2. As stated above (Question , Articles , 6), humility observes the rule of right reason whereby a man has true self-esteem. Now pride does not observe this rule of right reason, for he esteems himself greater than he is: and this is the outcome of an inordinate desire for his own excellence, since a man is ready to believe what he desires very much, the result being that his appetite is borne towards things higher than what become him. Consequently whatsoever things lead a man to inordinate self-esteem lead him to pride: and one of those is the observing of other people's failings, just as, on the other hand, in the words of Gregory (Moral. xxiii, 17), "holy men, by a like observation of other people's virtues, set others above themselves." Accordingly the conclusion is not that pride is in the rational faculty, but that one of its causes is in the reason.
3. Pride is in the irascible, not only as a part of the sensitive appetite, but also as having a more general signification, as stated above.
4. According to Augustine (De Civ. Dei xiv, 7,9), "love precedes all other emotions of the soul, and is their cause," wherefore it may be employed to denote any of the other emotions. It is in this sense that pride is said to be "love of one's own excellence," inasmuch as love makes a man presume inordinately on his superiority over others, and this belongs properly to pride.
Objection: 1. It seems that the four species of pride are unfittingly assigned by Gregory, who says (Moral. xxiii, 6): "There are four marks by which every kind of pride of the arrogant betrays itself; either when they think that their good is from themselves, or if they believe it to be from above, yet they think that it is due to their own merits; or when they boast of having what they have not, or despise others and wish to appear the exclusive possessors of what they have." For pride is a vice distinct from unbelief, just as humility is a distinct virtue from faith. Now it pertains to unbelief, if a man deem that he has not received his good from God, or that he has the good of grace through his own merits. Therefore this should not be reckoned a species of pride.
2. Further, the same thing should not be reckoned a species of different genera. Now boasting is reckoned a species of lying, as stated above (Question , Article ; Question ). Therefore it should not be accounted a species of pride.
3. Further, some other things apparently pertain to pride, which are not mentioned here. For Jerome [*Reference unknown] says that "nothing is so indicative of pride as to show oneself ungrateful": and Augustine says (De Civ. Dei xiv, 14) that "it belongs to pride to excuse oneself of a sin one has committed." Again, presumption whereby one aims at having what is above one, would seem to have much to do with pride. Therefore the aforesaid division does not sufficiently account for the different species of pride.
4. Further, we find other divisions of pride. For Anselm [*Eadmer, De Similit. xxii, seqq.] divides the uplifting of pride, saying that there is "pride of will, pride of speech, end pride of deed." Bernard [*De Grad. Humil. et Superb. x, seqq.] also reckons twelve degrees of pride, namely "curiosity, frivolity of mind, senseless mirth, boasting, singularity, arrogance, presumption, defense of one's sins, deceitful confession, rebelliousness, license, sinful habit." Now these apparently are not comprised under the species mentioned by Gregory. Therefore the latter would seem to be assigned unfittingly.
On the contrary The authority of Gregory suffices.
I answer that As stated above (Articles ,2,3), pride denotes immoderate desire of one's own excellence, a desire, to wit, that is not in accord with right reason. Now it must be observed that all excellence results from a good possessed. Such a good may be considered in three ways. First, in itself. For it is evident that the greater the good that one has, the greater the excellence that one derives from it. Hence when a man ascribes to himself a good greater than what he has, it follows that his appetite tends to his own excellence in a measure exceeding his competency: and thus we have the third species of pride, namely "boasting of having what one has not."Secondly, it may be considered with regard to its cause, in so far as to have a thing of oneself is more excellent than to have it of another. Hence when a man esteems the good he has received of another as though he had it of himself, the result is that his appetite is borne towards his own excellence immoderately. Now one is cause of one's own good in two ways, efficiently and meritoriously: and thus we have the first two species of pride, namely "when a man thinks he has from himself that which he has from God," or "when he believes that which he has received from above to be due to his own merits."Thirdly, it may be considered with regard to the manner of having it, in so far as a man obtains greater excellence through possessing some good more excellently than other men; the result again being that his appetite is borne inordinately towards his own excellence: and thus we have the fourth species of pride, which is "when a man despises others and wishes to be singularly conspicuous."
Reply to Objection: 1. A true judgment may be destroyed in two ways. First, universally: and thus in matters of faith, a true judgment is destroyed by unbelief. Secondly, in some particular matter of choice, and unbelief does not do this. Thus a man who commits fornication, judges that for the time being it is good for him to commit fornication; yet he is not an unbeliever, as he would be, were he to say that universally fornication is good. It is thus in the question in point: for it pertains to unbelief to assert universally that there is a good which is not from God, or that grace is given to men for their merits, whereas, properly speaking, it belongs to pride and not to unbelief, through inordinate desire of one's own excellence, to boast of one's goods as though one had them of oneself, or of one's own merits.
2. Boasting is reckoned a species of lying, as regards the outward act whereby a man falsely ascribes to himself what he has not: but as regards the inward arrogance of the heart it is reckoned by Gregory to be a species of pride.
3. The ungrateful man ascribes to himself what he has from another: wherefore the first two species of pride pertain to ingratitude. To excuse oneself of a sin one has committed, belongs to the third species, since by so doing a man ascribes to himself the good of innocence which he has not. To aim presumptuously at what is above one, would seem to belong chiefly to the fourth species, which consists in wishing to be preferred to others.
4. The three mentioned by Anselm correspond to the progress of any particular sin: for it begins by being conceived in thought, then is uttered in word, and thirdly is accomplished in deed.The twelve degrees mentioned by Bernard are reckoned by way of opposition to the twelve degrees of humility, of which we have spoken above (Question , Article ). For the first degree of humility is to "be humble in heart, and to show it in one's very person, one's eyes fixed on the ground": and to this is opposed "curiosity," which consists in looking around in all directions curiously and inordinately. The second degree of humility is "to speak few and sensible words, and not to be loud of voice": to this is opposed "frivolity of mind," by which a man is proud of speech. The third degree of humility is "not to be easily moved and disposed to laughter," to which is opposed "senseless mirth." The fourth degree of humility is "to maintain silence until one is asked," to which is opposed "boasting". The fifth degree of humility is "to do nothing but to what one is exhorted by the common rule of the monastery," to which is opposed "singularity," whereby a man wishes to seem more holy than others. The sixth degree of humility is "to believe and acknowledge oneself viler than all," to which is opposed "arrogance," whereby a man sets himself above others. The seventh degree of humility is "to think oneself worthless and unprofitable for all purposes," to which is opposed "presumption," whereby a man thinks himself capable of things that are above him. The eighth degree of humility is "to confess one's sins," to which is opposed "defense of one's sins." The ninth degree is "to embrace patience by obeying under difficult and contrary circumstances," to which is opposed "deceitful confession," whereby a man being unwilling to be punished for his sins confesses them deceitfully. The tenth degree of humility is "obedience," to which is opposed "rebelliousness." The eleventh degree of humility is "not to delight in fulfilling one's own desires"; to this is opposed "license," whereby a man delights in doing freely whatever he will. The last degree of humility is "fear of God": to this is opposed "the habit of sinning," which implies contempt of God.In these twelve degrees not only are the species of pride indicated, but also certain things that precede and follow them, as we have stated above with regard to humility (Question , Article ).
Objection: 1. It would seem that pride is not a mortal sin. For a gloss on Ps 7,4, "O Lord my God, if I have done this thing," says: "Namely, the universal sin which is pride." Therefore if pride were a mortal sin, so would every sin be.
2. Further, every mortal sin is contrary to charity. But pride is apparently not contrary to charity, neither as to the love of God, nor as to the love of one's neighbor, because the excellence which, by pride, one desires inordinately, is not always opposed to God's honor, or our neighbor's good. Therefore pride is not a mortal sin.
3. Further, every mortal sin is opposed to virtue. But pride is not opposed to virtue; on the contrary, it arises therefrom, for as Gregory says (Moral. xxxiv, 23), "sometimes a man is elated by sublime and heavenly virtues." Therefore pride is not a mortal sin.
On the contrary Gregory says (Moral. xxxiv, 23) that "pride is a most evident sign of the reprobate, and contrariwise, humility of the elect." But men do not become reprobate on account of venial sins. Therefore pride is not a venial but a mortal sin.
I answer that Pride is opposed to humility. Now humility properly regards the subjection of man to God, as stated above (Question , Article , ad 5). Hence pride properly regards lack of this subjection, in so far as a man raises himself above that which is appointed to him according to the Divine rule or measure, against the saying of the Apostle (2Co 10,13), "But we will not glory beyond our measure; but according to the measure of the rule which God hath measured to us." Wherefore it is written (Si 10,14): "The beginning of the pride of man is to fall off from God" because, to wit, the root of pride is found to consist in man not being, in some way, subject to God and His rule. Now it is evident that not to be subject to God is of its very nature a mortal sin, for this consists in turning away from God: and consequently pride is, of its genus, a mortal sin. Nevertheless just as in other sins which are mortal by their genus (for instance fornication and adultery) there are certain motions that are venial by reason of their imperfection (through forestalling the judgment of reason, and being without its consent), so too in the matter of pride it happens that certain motions of pride are venial sins, when reason does not consent to them.
Reply to Objection: 1. As stated above (Article ) pride is a general sin, not by its essence but by a kind of influence, in so far as all sins may have their origin in pride. Hence it does not follow that all sins are mortal, but only such as arise from perfect pride, which we have stated to be a mortal sin.
2. Pride is always contrary to the love of God, inasmuch as the proud man does not subject himself to the Divine rule as he ought. Sometimes it is also contrary to the love of our neighbor; when, namely, a man sets himself inordinately above his neighbor: and this again is a transgression of the Divine rule, which has established order among men, so that one ought to be subject to another.
3. Pride arises from virtue, not as from its direct cause, but as from an accidental cause, in so far as a man makes a virtue an occasion for pride. And nothing prevents one contrary from being the accidental cause of another, as stated in Phys. viii, 1. Hence some are even proud of their humility.
Objection: 1. It would seem that pride is not the most grievous of sins. For the more difficult a sin is to avoid, the less grievous it would seem to be. Now pride is most difficult to avoid; for Augustine says in his Rule (Ep. ccxi), "Other sins find their vent in the accomplishment of evil deeds, whereas pride lies in wait for good deeds to destroy them." Therefore pride is not the most grievous of sins.
2. Further, "The greater evil is opposed to the greater good," as the Philosopher asserts (Ethic. viii, 10). Now humility to which pride is opposed is not the greatest of virtues, as stated above (Question , Article ). Therefore the vices that are opposed to greater virtues, such as unbelief, despair, hatred of God, murder, and so forth, are more grievous sins than pride.
3. Further, the greater evil is not punished by a lesser evil. But pride is sometimes punished by other sins according to Rm 1,28, where it is stated that on account of their pride of heart, men of science were delivered "to a reprobate sense, to do those things which are not convenient." Therefore pride is not the most grievous of sins.
On the contrary A gloss on Ps 118,51, "The proud did iniquitously," says: "The greatest sin in man is pride."
I answer that Two things are to be observed in sin, conversion to a mutable good, and this is the material part of sin; and aversion from the immutable good, and this gives sin its formal aspect and complement. Now on the part of the conversion, there is no reason for pride being the greatest of sins, because uplifting which pride covets inordinately, is not essentially most incompatible with the good of virtue. But on the part of the aversion, pride has extreme gravity, because in other sins man turns away from God, either through ignorance or through weakness, or through desire for any other good whatever; whereas pride denotes aversion from God simply through being unwilling to be subject to God and His rule. Hence Boethius [*Cf. Cassian, de Caenob. Inst. xii, 7] says that "while all vices flee from God, pride alone withstands God"; for which reason it is specially stated (Jc 4,6) that "God resisteth the proud." Wherefore aversion from God and His commandments, which is a consequence as it were in other sins, belongs to pride by its very nature, for its act is the contempt of God. And since that which belongs to a thing by its nature is always of greater weight than that which belongs to it through something else, it follows that pride is the most grievous of sins by its genus, because it exceeds in aversion which is the formal complement of sin.
Reply to Objection: 1. A sin is difficult to avoid in two ways.First, on account of the violence of its onslaught; thus anger is violent in its onslaught on account of its impetuosity; and "still more difficult is it to resist concupiscence, on account of its connaturality," as stated in Ethic. ii, 3,9. A difficulty of this kind in avoiding sin diminishes the gravity of the sin; because a man sins the more grievously, according as he yields to a less impetuous temptation, as Augustine says (De Civ. Dei xiv, 12,15).Secondly, it is difficult to avoid a sin, on account of its being hidden. In this way it is difficult to avoid pride, since it takes occasion even from good deeds, as stated (Article , ad 3). Hence Augustine says pointedly that it "lies in wait for good deeds"; and it is written (Ps 141,4): "In the way wherein I walked, the proud [*Cf. Ps 139,6, 'The proud have hidden a net for me.'] [Vulg.: 'they'] have hidden a snare for me." Hence no very great gravity attaches to the movement of pride while creeping in secretly, and before it is discovered by the judgment of reason: but once discovered by reason, it is easily avoided, both by considering one's own infirmity, according to Si 10,9, "Why is earth and ashes proud?" and by considering God's greatness, according to Jb 15,13, "Why doth thy spirit swell against God?" as well as by considering the imperfection of the goods on which man prides himself, according to Is 40,6, "All flesh is grass, and all the glory thereof as the flower of the field"; and farther on (Is 64,6), "all our justices" are become "like the rag of a menstruous woman."
2. Opposition between a vice and a virtue is inferred from the object, which is considered on the part of conversion. In this way pride has no claim to be the greatest of sins, as neither has humility to be the greatest of virtues. But it is the greatest on the part of aversion, since it brings greatness upon other sins. For unbelief, by the very fact of its arising out of proud contempt, is rendered more grievous than if it be the outcome of ignorance or weakness. The same applies to despair and the like.
3. Just as in syllogisms that lead to an impossible conclusion one is sometimes convinced by being faced with a more evident absurdity, so too, in order to overcome their pride, God punishes certain men by allowing them to fall into sins of the flesh, which though they be less grievous are more evidently shameful. Hence Isidore says (De Summo Bono ii, 38) that "pride is the worst of all vices; whether because it is appropriate to those who are of highest and foremost rank, or because it originates from just and virtuous deeds, so that its guilt is less perceptible. on the other hand, carnal lust is apparent to all, because from the outset it is of a shameful nature: and yet, under God's dispensation, it is less grievous than pride. For he who is in the clutches of pride and feels it not, falls into the lusts of the flesh, that being thus humbled he may rise from his abasement."From this indeed the gravity of pride is made manifest. For just as a wise physician, in order to cure a worse disease, allows the patient to contract one that is less dangerous, so the sin of pride is shown to be more grievous by the very fact that, as a remedy, God allows men to fall into other sins.
Summa Th. II-II EN Qu.162