Summa Th. I-II EN Qu.83 a.3
1663
Objection: 1. It would seem that original sin does not infect the will before the other powers. For every sin belongs chiefly to that power by whose act it was caused. Now original sin is caused by an act of the generative power. Therefore it seems to belong to the generative power more than to the others.
2. Further, original sin is transmitted through the carnal semen. But the other powers of the soul are more akin to the flesh than the will is, as is evident with regard to all the sensitive powers, which use a bodily organ. Therefore original sin is in them more than in the will.
3. Further, the intellect precedes the will, for the object of the will is only the good understood. If therefore original sin infects all the powers of the soul, it seems that it must first of all infect the intellect, as preceding the others.
On the contrary Original justice has a prior relation to the will, because it is "rectitude of the will," as Anselm states (De Concep. Virg. iii). Therefore original sin, which is opposed to it, also has a prior relation to the will.
I answer that Two things must be considered in the infection of original sin. First, its inherence to its subject; and in this respect it regards first the essence of the soul, as stated above (Article [2]). In the second place we must consider its inclination to act; and in this way it regards the powers of the soul. It must therefore regard first of all that power in which is seated the first inclination to commit a sin, and this is the will, as stated above (Question [74], Articles [1],2). Therefore original sin regards first of all the will.
Reply to Objection: 1. Original sin, in man, is not caused by the generative power of the child, but by the act of the parental generative power. Consequently, it does not follow that the child's generative power is the subject of original sin.
2. Original sin spreads in two ways; from the flesh to the soul, and from the essence of the soul to the powers. The former follows the order of generation, the latter follows the order of perfection. Therefore, although the other, viz. the sensitive powers, are more akin to the flesh, yet, since the will, being the higher power, is more akin to the essence of the soul, the infection of original sin reaches it first.
3. The intellect precedes the will, in one way, by proposing its object to it. In another way, the will precedes the intellect, in the order of motion to act, which motion pertains to sin.
1664
Objection: 1. It would seem that the aforesaid powers are not more infected than the others. For the infection of original sin seems to pertain more to that part of the soul which can be first the subject of sin. Now this is the rational part, and chiefly the will. Therefore that power is most infected by original sin.
2. Further, no power of the soul is infected by guilt, except in so far as it can obey reason. Now the generative power cannot obey reason, as stated in Ethic. i, 13. Therefore the generative power is not the most infected by original sin.
3. Further, of all the senses the sight is the most spiritual and the nearest to reason, in so far "as it shows us how a number of things differ" (Metaph. i). But the infection of guilt is first of all in the reason. Therefore the sight is more infected than touch.
On the contrary Augustine says (De Civ. Dei xiv, 16, seqq., 24) that the infection of original sin is most apparent in the movements of the members of generation, which are not subject to reason. Now those members serve the generative power in the mingling of sexes, wherein there is the delectation of touch, which is the most powerful incentive to concupiscence. Therefore the infection of original sin regards these three chiefly, viz. the generative power, the concupiscible faculty and the sense of touch.
I answer that Those corruptions especially are said to be infectious, which are of such a nature as to be transmitted from one subject to another: hence contagious diseases, such as leprosy and murrain and the like, are said to be infectious. Now the corruption of original sin is transmitted by the act of generation, as stated above (Question [81], Article [1]). Therefore the powers which concur in this act, are chiefly said to be infected. Now this act serves the generative power, in as much as it is directed to generation; and it includes delectation of the touch, which is the most powerful object of the concupiscible faculty. Consequently, while all the parts of the soul are said to be corrupted by original sin, these three are said specially to be corrupted and infected.
Reply to Objection: 1. Original sin, in so far as it inclines to actual sins, belongs chiefly to the will, as stated above (Article [3]). But in so far as it is transmitted to the offspring, it belongs to the aforesaid powers proximately, and to the will, remotely.
2. The infection of actual sin belongs only to the powers which are moved by the will of the sinner. But the infection of original sin is not derived from the will of the contractor, but through his natural origin, which is effected by the generative power. Hence it is this power that is infected by original sin.
3. Sight is not related to the act of generation except in respect of remote disposition, in so far as the concupiscible species is seen through the sight. But the delectation is completed in the touch. Wherefore the aforesaid infection is ascribed to the touch rather than to the sight.
1680
We must now consider the cause of sin, in so far as one sin can be the cause of another. Under this head there are four points of inquiry:
(1) Whether covetousness is the root of all sins?
(2) Whether pride is the beginning of every sin?
(3) Whether other special sins should be called capital vices, besides pride and covetousness?
(4) How many capital vices there are, and which are they?
1681
Objection: 1. It would seem that covetousness is not the root of all sins. For covetousness, which is immoderate desire for riches, is opposed to the virtue of liberality. But liberality is not the root of all virtues. Therefore covetousness is not the root of all sins.
2. Further, the desire for the means proceeds from desire for the end. Now riches, the desire for which is called covetousness, are not desired except as being useful for some end, as stated in Ethic. i, 5. Therefore covetousness is not the root of all sins, but proceeds from some deeper root.
3. Further, it often happens that avarice, which is another name for covetousness, arises from other sins; as when a man desires money through ambition, or in order to sate his gluttony. Therefore it is not the root of all sins.
On the contrary The Apostle says (1Tm 6,10): "The desire of money is the root of all evil."
I answer that According to some, covetousness may be understood in different ways. First, as denoting inordinate desire for riches: and thus it is a special sin. Secondly, as denoting inordinate desire for any temporal good: and thus it is a genus comprising all sins, because every sin includes an inordinate turning to a mutable good, as stated above (Question [72], Article [2]). Thirdly, as denoting an inclination of a corrupt nature to desire corruptible goods inordinately: and they say that in this sense covetousness is the root of all sins, comparing it to the root of a tree, which draws its sustenance from earth, just as every sin grows out of the love of temporal things.Now, though all this is true, it does not seem to explain the mind of the Apostle when he states that covetousness is the root of all sins. For in that passage he clearly speaks against those who, because they "will become rich, fall into temptation, and into the snare of the devil . . . for covetousness is the root of all evils." Hence it is evident that he is speaking of covetousness as denoting the inordinate desire for riches. Accordingly, we must say that covetousness, as denoting a special sin, is called the root of all sins, in likeness to the root of a tree, in furnishing sustenance to the whole tree. For we see that by riches man acquires the means of committing any sin whatever, and of sating his desire for any sin whatever, since money helps man to obtain all manner of temporal goods, according to Qo 10,19: "All things obey money": so that in this desire for riches is the root of all sins.
Reply to Objection: 1. Virtue and sin do not arise from the same source. For sin arises from the desire of mutable good; and consequently the desire of that good which helps one to obtain all temporal goods, is called the root of all sins. But virtue arises from the desire for the immutable God; and consequently charity, which is the love of God, is called the root of the virtues, according to Ep 3,17: "Rooted and founded in charity."
2. The desire of money is said to be the root of sins, not as though riches were sought for their own sake, as being the last end; but because they are much sought after as useful for any temporal end. And since a universal good is more desirable than a particular good, they move the appetite more than any individual goods, which along with many others can be procured by means of money.
3. Just as in natural things we do not ask what always happens, but what happens most frequently, for the reason that the nature of corruptible things can be hindered, so as not always to act in the same way; so also in moral matters, we consider what happens in the majority of cases, not what happens invariably, for the reason that the will does not act of necessity. So when we say that covetousness is the root of all evils, we do not assert that no other evil can be its root, but that other evils more frequently arise therefrom, for the reason given.
1682
Objection: 1. It would seem that pride is not the beginning of every sin. For the root is a beginning of a tree, so that the beginning of a sin seems to be the same as the root of sin. Now covetousness is the root of every sin, as stated above (Article [1]). Therefore it is also the beginning of every sin, and not pride.
2. Further, it is written (Si 10,14): "The beginning of the pride of man is apostasy [Douay: 'to fall off'] from God." But apostasy from God is a sin. Therefore another sin is the beginning of pride, so that the latter is not the beginning of every sin.
3. Further, the beginning of every sin would seem to be that which causes all sins. Now this is inordinate self-love, which, according to Augustine (De Civ. Dei xiv), "builds up the city of Babylon." Therefore self-love and not pride, is the beginning of every sin.
On the contrary It is written (Si 10,15): "Pride is the beginning of all sin."
I answer that Some say pride is to be taken in three ways. First, as denoting inordinate desire to excel; and thus it is a special sin. Secondly, as denoting actual contempt of God, to the effect of not being subject to His commandment; and thus, they say, it is a generic sin. Thirdly, as denoting an inclination to this contempt, owing to the corruption of nature; and in this sense they say that it is the beginning of every sin, and that it differs from covetousness, because covetousness regards sin as turning towards the mutable good by which sin is, as it were, nourished and fostered, for which reason covetousness is called the "root"; whereas pride regards sin as turning away from God, to Whose commandment man refuses to be subject, for which reason it is called the "beginning," because the beginning of evil consists in turning away from God.
Now though all this is true, nevertheless it does not explain the mind of the wise man who said (Si 10,15): "Pride is the beginning of all sin." For it is evident that he is speaking of pride as denoting inordinate desire to excel, as is clear from what follows (verse 17): "God hath overturned the thrones of proud princes"; indeed this is the point of nearly the whole chapter. We must therefore say that pride, even as denoting a special sin, is the beginning of every sin. For we must take note that, in voluntary actions, such as sins, there is a twofold order, of intention, and of execution. In the former order, the principle is the end, as we have stated many times before (Question [1], Article [1], ad 1; Question [18], Article [7], ad 2; Question [15], Article [1], ad 2; Question [25], Article [2]). Now man's end in acquiring all temporal goods is that, through their means, he may have some perfection and excellence. Therefore, from this point of view, pride, which is the desire to excel, is said to be the "beginning" of every sin. On the other hand, in the order of execution, the first place belongs to that which by furnishing the opportunity of fulfilling all desires of sin, has the character of a root, and such are riches; so that, from this point of view, covetousness is said to be the "root" of all evils, as stated above (Article [1]).
Reply to Objection: 1. This suffices for the Reply to the First Objection.
2. Apostasy from God is stated to be the beginning of pride, in so far as it denotes a turning away from God, because from the fact that man wishes not to be subject to God, it follows that he desires inordinately his own excellence in temporal things. Wherefore, in the passage quoted, apostasy from God does not denote the special sin, but rather that general condition of every sin, consisting in its turning away from God. It may also be said that apostasy from God is said to be the beginning of pride, because it is the first species of pride. For it is characteristic of pride to be unwilling to be subject to any superior, and especially to God; the result being that a man is unduly lifted up, in respect of the other species of pride.
3. In desiring to excel, man loves himself, for to love oneself is the same as to desire some good for oneself. Consequently it amounts to the same whether we reckon pride or self-love as the beginning of every evil.
1683
Objection: 1. It would seem that no other special sins, besides pride and avarice, should be called capital. Because "the head seems to be to an animal, what the root is to a plant," as stated in De Anima ii, text. 38: for the roots are like a mouth. If therefore covetousness is called the "root of all evils," it seems that it alone, and no other sin, should be called a capital vice.
2. Further, the head bears a certain relation of order to the other members, in so far as sensation and movement follow from the head. But sin implies privation of order. Therefore sin has not the character of head: so that no sins should be called capital.
3. Further, capital crimes are those which receive capital punishment. But every kind of sin comprises some that are punished thus. Therefore the capital sins are not certain specific sins.
On the contrary Gregory (Moral. xxxi, 17) enumerates certain special vices under the name of capital.
I answer that The word capital is derived from "caput" [a head]. Now the head, properly speaking, is that part of an animal's body, which is the principle and director of the whole animal. Hence, metaphorically speaking, every principle is called a head, and even men who direct and govern others are called heads. Accordingly a capital vice is so called, in the first place, from "head" taken in the proper sense, and thus the name "capital" is given to a sin for which capital punishment is inflicted. It is not in this sense that we are now speaking of capital sins, but in another sense, in which the term "capital" is derived from head, taken metaphorically for a principle or director of others. In this way a capital vice is one from which other vices arise, chiefly by being their final cause, which origin is formal, as stated above (Question [72], Article [6]). Wherefore a capital vice is not only the principle of others, but is also their director and, in a way, their leader: because the art or habit, to which the end belongs, is always the principle and the commander in matters concerning the means. Hence Gregory (Moral. xxxi, 17) compares these capital vices to the "leaders of an army."
Reply to Objection: 1. The term "capital" is taken from "caput" and applied to something connected with, or partaking of the head, as having some property thereof, but not as being the head taken literally. And therefore the capital vices are not only those which have the character of primary origin, as covetousness which is called the "root," and pride which is called the beginning, but also those which have the character of proximate origin in respect of several sins.
2. Sin lacks order in so far as it turns away from God, for in this respect it is an evil, and evil, according to Augustine (De Natura Boni iv), is "the privation of mode, species and order." But in so far as sin implies a turning to something, it regards some good: wherefore, in this respect, there can be order in sin.
3. This objection considers capital sin as so called from the punishment it deserves, in which sense we are not taking it here.
1684
Objection: 1. It would seem that we ought not to reckon seven capital vices, viz. vainglory, envy, anger, sloth, covetousness, gluttony, lust. For sins are opposed to virtues. But there are four principal virtues, as stated above (Question [61], Article [2]). Therefore there are only four principal or capital vices.
2. Further, the passions of the soul are causes of sin, as stated above (Question [77]). But there are four principal passions of the soul; two of which, viz. hope and fear, are not mentioned among the above sins, whereas certain vices are mentioned to which pleasure and sadness belong, since pleasure belongs to gluttony and lust, and sadness to sloth and envy. Therefore the principal sins are unfittingly enumerated.
3. Further, anger is not a principal passion. Therefore it should not be placed among the principal vices.
4. Further, just as covetousness or avarice is the root of sin, so is pride the beginning of sin, as stated above (Article [2]). But avarice is reckoned to be one of the capital vices. Therefore pride also should be placed among the capital vices.
5. Further, some sins are committed which cannot be caused through any of these: as, for instance, when one sins through ignorance, or when one commits a sin with a good intention, e.g. steals in order to give an alms. Therefore the capital vices are insufficiently enumerated.
On the contrary stands the authority of Gregory who enumerates them in this way (Moral. xxxi, 17).
I answer that As stated above (Article [3]), the capital vices are those which give rise to others, especially by way of final cause. Now this kind of origin may take place in two ways. First, on account of the condition of the sinner, who is disposed so as to have a strong inclination for one particular end, the result being that he frequently goes forward to other sins. But this kind of origin does not come under the consideration of art, because man's particular dispositions are infinite in number. Secondly, on account of a natural relationship of the ends to one another: and it is in this way that most frequently one vice arises from another, so that this kind of origin can come under the consideration of art.Accordingly therefore, those vices are called capital, whose ends have certain fundamental reasons for moving the appetite; and it is in respect of these fundamental reasons that the capital vices are differentiated. Now a thing moves the appetite in two ways. First, directly and of its very nature: thus good moves the appetite to seek it, while evil, for the same reason, moves the appetite to avoid it. Secondly, indirectly and on account of something else, as it were: thus one seeks an evil on account of some attendant good, or avoids a good on account of some attendant evil.Again, man's good is threefold. For, in the first place, there is a certain good of the soul, which derives its aspect of appetibility, merely through being apprehended, viz. the excellence of honor and praise, and this good is sought inordinately by "vainglory." Secondly, there is the good of the body, and this regards either the preservation of the individual, e.g. meat and drink, which good is pursued inordinately by "gluttony," or the preservation of the species, e.g. sexual intercourse, which good is sought inordinately by "lust." Thirdly, there is external good, viz. riches, to which "covetousness" is referred. These same four vices avoid inordinately the contrary evils.Or again, good moves the appetite chiefly through possessing some property of happiness, which all men seek naturally. Now in the first place happiness implies perfection, since happiness is a perfect good, to which belongs excellence or renown, which is desired by "pride" or "vainglory." Secondly, it implies satiety, which "covetousness" seeks in riches that give promise thereof. Thirdly, it implies pleasure, without which happiness is impossible, as stated in Ethic. i, 7; x, 6,7,[8] and this "gluttony" and "lust" pursue.On the other hand, avoidance of good on account of an attendant evil occurs in two ways. For this happens either in respect of one's own good, and thus we have "sloth," which is sadness about one's spiritual good, on account of the attendant bodily labor: or else it happens in respect of another's good, and this, if it be without recrimination, belongs to "envy," which is sadness about another's good as being a hindrance to one's own excellence, while if it be with recrimination with a view to vengeance, it is "anger." Again, these same vices seek the contrary evils.
Reply to Objection: 1. Virtue and vice do not originate in the same way: since virtue is caused by the subordination of the appetite to reason, or to the immutable good, which is God, whereas vice arises from the appetite for mutable good. Wherefore there is no need for the principal vices to be contrary to the principal virtues.
2. Fear and hope are irascible passions. Now all the passions of the irascible part arise from passions of the concupiscible part; and these are all, in a way, directed to pleasure or sorrow. Hence pleasure and sorrow have a prominent place among the capital sins, as being the most important of the passions, as stated above (Question [25], Article [4]).
3. Although anger is not a principal passion, yet it has a distinct place among the capital vices, because it implies a special kind of movement in the appetite, in so far as recrimination against another's good has the aspect of a virtuous good, i.e. of the right to vengeance.
4. Pride is said to be the beginning of every sin, in the order of the end, as stated above (Article [2]): and it is in the same order that we are to consider the capital sin as being principal. Wherefore pride, like a universal vice, is not counted along with the others, but is reckoned as the "queen of them all," as Gregory states (Moral. xxxi, 27). But covetousness is said to be the root from another point of view, as stated above (Articles [1],2).
5. These vices are called capital because others, most frequently, arise from them: so that nothing prevents some sins from arising out of other causes. Nevertheless we might say that all the sins which are due to ignorance, can be reduced to sloth, to which pertains the negligence of a man who declines to acquire spiritual goods on account of the attendant labor; for the ignorance that can cause sin, is due to negligence, as stated above (Question [76], Article [2]). That a man commit a sin with a good intention, seems to point to ignorance, in so far as he knows not that evil should not be done that good may come of it.
1700
We must now consider the effects of sin; and (1) the corruption of the good of nature; (2) the stain on the soul; (3) the debt of punishment.
Under the first head there are six points of inquiry:
(1) Whether the good of nature is diminished by sin?
(2) Whether it can be taken away altogether?
(3) Of the four wounds, mentioned by Bede, with which human nature is stricken in consequence of sin.
(4) Whether privation of mode, species and order is an effect of sin?
(5) Whether death and other bodily defects are the result of sin?
(6) Whether they are, in any way, natural to man?
1701
Objection: 1. It would seem that sin does not diminish the good of nature. For man's sin is no worse than the devil's. But natural good remains unimpaired in devils after sin, as Dionysius states (Div. Nom. iv). Therefore neither does sin diminish the good of human nature.
2. Further, when that which follows is changed, that which precedes remains unchanged, since substance remains the same when its accidents are changed. But nature exists before the voluntary action. Therefore, when sin has caused a disorder in a voluntary act, nature is not changed on that account, so that the good of nature be diminished.
3. Further, sin is an action, while diminution is a passion. Now no agent is passive by the very reason of its acting, although it is possible for it to act on one thing, and to be passive as regards another. Therefore he who sins, does not, by his sin, diminish the good of his nature.
4. Further, no accident acts on its subject: because that which is patient is a potential being, while that which is subjected to an accident, is already an actual being as regards that accident. But sin is in the good of nature as an accident in a subject. Therefore sin does not diminish the good of nature, since to diminish is to act.
On the contrary "A certain man going down from Jerusalem to Jericho (Lc 10,30), i.e. to the corruption of sin, was stripped of his gifts, and wounded in his nature," as Bede [*The quotation is from the Glossa Ordinaria of Strabo] expounds the passage. Therefore sin diminishes the good of nature.
I answer that The good of human nature is threefold. First, there are the principles of which nature is constituted, and the properties that flow from them, such as the powers of the soul, and so forth. Secondly, since man has from nature an inclination to virtue, as stated above (Question [60], Article [1]; Question [63], Article [1]), this inclination to virtue is a good of nature. Thirdly, the gift of original justice, conferred on the whole of human nature in the person of the first man, may be called a good of nature.Accordingly, the first-mentioned good of nature is neither destroyed nor diminished by sin. The third good of nature was entirely destroyed through the sin of our first parent. But the second good of nature, viz. the natural inclination to virtue, is diminished by sin. Because human acts produce an inclination to like acts, as stated above (Question [50], Article [1]). Now from the very fact that thing becomes inclined to one of two contraries, its inclination to the other contrary must needs be diminished. Wherefore as sin is opposed to virtue, from the very fact that a man sins, there results a diminution of that good of nature, which is the inclination to virtue.
Reply to Objection: 1. Dionysius is speaking of the first-mentioned good of nature, which consists in "being, living and understanding," as anyone may see who reads the context.
2. Although nature precedes the voluntary action, it has an inclination to a certain voluntary action. Wherefore nature is not changed in itself, through a change in the voluntary action: it is the inclination that is changed in so far as it is directed to its term.
3. A voluntary action proceeds from various powers, active and passive. The result is that through voluntary actions something is caused or taken away in the man who acts, as we have stated when treating of the production of habits (Question [51], Article [2]).
4. An accident does not act effectively on its subject, but it acts on it formally, in the same sense as when we say that whiteness makes a thing white. In this way there is nothing to hinder sin from diminishing the good of nature; but only in so far as sin is itself a diminution of the good of nature, through being an inordinateness of action. But as regards the inordinateness of the agent, we must say that such like inordinateness is caused by the fact that in the acts of the soul, there is an active, and a passive element: thus the sensible object moves the sensitive appetite, and the sensitive appetite inclines the reason and will, as stated above (Question [77], Articles [1], 2). The result of this is the inordinateness, not as though an accident acted on its own subject, but in so far as the object acts on the power, and one power acts on another and puts it out of order.
1702
Objection: 1. It would seem that the entire good of human nature can be destroyed by sin. For the good of human nature is finite, since human nature itself is finite. Now any finite thing is entirely taken away, if the subtraction be continuous. Since therefore the good of nature can be continually diminished by sin, it seems that in the end it can be entirely taken away.
2. Further, in a thing of one nature, the whole and the parts are uniform, as is evidently the case with air, water, flesh and all bodies with similar parts. But the good of nature is wholly uniform. Since therefore a part thereof can be taken away by sin, it seems that the whole can also be taken away by sin.
3. Further, the good of nature, that is weakened by sin, is aptitude for virtue. Now this aptitude is destroyed entirely in some on account of sin: thus the lost cannot be restored to virtue any more than the blind can to sight. Therefore sin can take away the good of nature entirely.
On the contrary Augustine says (Enchiridion xiv) that "evil does not exist except in some good." But the evil of sin cannot be in the good of virtue or of grace, because they are contrary to it. Therefore it must be in the good of nature, and consequently it does not destroy it entirely.
I answer that As stated above (Article [1]), the good of nature, that is diminished by sin, is the natural inclination to virtue, which is befitting to man from the very fact that he is a rational being; for it is due to this that he performs actions in accord with reason, which is to act virtuously. Now sin cannot entirely take away from man the fact that he is a rational being, for then he would no longer be capable of sin. Wherefore it is not possible for this good of nature to be destroyed entirely.Since, however, this same good of nature may be continually diminished by sin, some, in order to illustrate this, have made use of the example of a finite thing being diminished indefinitely, without being entirely destroyed. For the Philosopher says (Phys. i, text. 37) that if from a finite magnitude a continual subtraction be made in the same quantity, it will at last be entirely destroyed, for instance if from any finite length I continue to subtract the length of a span. If, however, the subtraction be made each time in the same proportion, and not in the same quantity, it may go on indefinitely, as, for instance, if a quantity be halved, and one half be diminished by half, it will be possible to go on thus indefinitely, provided that what is subtracted in each case be less than what was subtracted before. But this does not apply to the question at issue, since a subsequent sin does not diminish the good of nature less than a previous sin, but perhaps more, if it be a more grievous sin.We must, therefore, explain the matter otherwise by saying that the aforesaid inclination is to be considered as a middle term between two others: for it is based on the rational nature as on its root, and tends to the good of virtue, as to its term and end. Consequently its diminution may be understood in two ways: first, on the part of its rood, secondly, on the part of its term. In the first way, it is not diminished by sin, because sin does not diminish nature, as stated above (Article [1]). But it is diminished in the second way, in so far as an obstacle is placed against its attaining its term. Now if it were diminished in the first way, it would needs be entirely destroyed at last by the rational nature being entirely destroyed. Since, however, it is diminished on the part of the obstacle which is place against its attaining its term, it is evident that it can be diminished indefinitely, because obstacles can be placed indefinitely, inasmuch as man can go on indefinitely adding sin to sin: and yet it cannot be destroyed entirely, because the root of this inclination always remains. An example of this may be seen in a transparent body, which has an inclination to receive light, from the very fact that it is transparent; yet this inclination or aptitude is diminished on the part of supervening clouds, although it always remains rooted in the nature of the body.
Reply to Objection: 1. This objection avails when diminution is made by subtraction. But here the diminution is made by raising obstacles, and this neither diminishes nor destroys the root of the inclination, as stated above.
2. The natural inclination is indeed wholly uniform: nevertheless it stands in relation both to its principle and to its term, in respect of which diversity of relation, it is diminished on the one hand, and not on the other.
3. Even in the lost the natural inclination to virtue remains, else they would have no remorse of conscience. That it is not reduced to act is owing to their being deprived of grace by Divine justice. Thus even in a blind man the aptitude to see remains in the very root of his nature, inasmuch as he is an animal naturally endowed with sight: yet this aptitude is not reduced to act, for the lack of a cause capable of reducing it, by forming the organ requisite for sight.
Summa Th. I-II EN Qu.83 a.3