Whether sin diminishes the good of nature?
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.
Objection 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.
Objection 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.
Objection 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 (Lk. 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 (Q 60, A 1; Q 63, A 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 (Q 50, A 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.
Reply to Objection 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.
Reply to Objection 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 (Q 51, A 2).
Reply to Objection 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 (Q 77, AA 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.
I–II · Q. 85, Art. 2: Whether the entire good of human nature can be destroyed by sin?
Whether the entire good of human nature can be destroyed by sin?
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.
Objection 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.
Objection 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 (A 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 (A 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.
Reply to Objection 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.
Reply to Objection 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.