Part II (Pars Prima Secundae) Part 117 (1/2)

_I answer that,_ As stated above (AA. 2, 3), sin may be found in any power whose act can be voluntary and inordinate, wherein consists the nature of sin. Now it is evident that the act of the sensuality, or sensitive appet.i.te, is naturally inclined to be moved by the will.

Wherefore it follows that sin can be in the sensuality.

Reply Obj. 1: Although some of the powers of the sensitive part are common to us and irrational animals, nevertheless, in us, they have a certain excellence through being united to the reason; thus we surpa.s.s other animals in the sensitive part for as much as we have the powers of cogitation and reminiscence, as stated in the First Part (Q. 78, A. 4). In the same way our sensitive appet.i.te surpa.s.ses that of other animals by reason of a certain excellence consisting in its natural apt.i.tude to obey the reason; and in this respect it can be the principle of a voluntary action, and, consequently, the subject of sin.

Reply Obj. 2: The continual corruption of the sensuality is to be understood as referring to the _fomes,_ which is never completely destroyed in this life, since, though the stain of original sin pa.s.ses, its effect remains. However, this corruption of the _fomes_ does not hinder man from using his rational will to check individual inordinate movements, if he be presentient of them, for instance by turning his thoughts to other things. Yet while he is turning his thoughts to something else, an inordinate movement may arise about this also: thus when a man, in order to avoid the movements of concupiscence, turns his thoughts away from carnal pleasures, to the considerations of science, sometimes an unpremeditated movement of vainglory will arise. Consequently, a man cannot avoid all such movements, on account of the aforesaid corruption: but it is enough, for the conditions of a voluntary sin, that he be able to avoid each single one.

Reply Obj. 3: Man does not do perfectly himself what he does without the deliberation of reason, since the princ.i.p.al part of man does nothing therein: wherefore such is not perfectly a human act; and consequently it cannot be a perfect act of virtue or of sin, but is something imperfect of that kind. Therefore such movement of the sensuality as forestalls the reason, is a venial sin, which is something imperfect in the genus of sin.

________________________

FOURTH ARTICLE [I-II, Q. 74, Art. 4]

Whether Mortal Sin Can Be in the Sensuality?

Objection 1: It would seem that mortal sin can be in the sensuality.

Because an act is discerned by its object. Now it is possible to commit a mortal sin about the objects of the sensuality, e.g. about carnal pleasures. Therefore the act of the sensuality can be a mortal sin, so that mortal sin can be found in the sensuality.

Obj. 2: Further, mortal sin is opposed to virtue. But virtue can be in the sensuality; for temperance and fort.i.tude are virtues of the irrational parts, as the Philosopher states (Ethic. iii, 10).

Therefore, since it is natural to contraries to be about the same subject, sensuality can be the subject of mortal sin.

Obj. 3: Further, venial sin is a disposition to mortal sin. Now disposition and habit are in the same subject. Since therefore venial sin may be in the sensuality, as stated above (A. 3, ad 3), mortal sin can be there also.

_On the contrary,_ Augustine says (Retract. i, 23): ”The inordinate movement of concupiscence, which is the sin of the sensuality, can even be in those who are in a state of grace,” in whom, however, mortal sin is not to be found. Therefore the inordinate movement of the sensuality is not a mortal sin.

_I answer that,_ Just as a disorder which destroys the principle of the body's life causes the body's death, so too a disorder which destroys the principle of spiritual life, viz. the last end, causes spiritual death, which is mortal sin, as stated above (Q. 72, A. 5).

Now it belongs to the reason alone, and not to the sensuality, to order anything to the end: and disorder in respect of the end can only belong to the power whose function it is to order others to the end. Wherefore mortal sin cannot be in the sensuality, but only in the reason.

Reply Obj. 1: The act of the sensuality can concur towards a mortal sin: yet the fact of its being a mortal sin is due, not to its being an act of the sensuality, but to its being an act of reason, to whom the ordering to the end belongs. Consequently mortal sin is imputed, not to the sensuality, but to reason.

Reply Obj. 2: An act of virtue is perfected not only in that it is an act of the sensuality, but still more in the fact of its being an act of reason and will, whose function it is to choose: for the act of moral virtue is not without the exercise of choice: wherefore the act of moral virtue, which perfects the appet.i.tive power, is always accompanied by an act of prudence, which perfects the rational power; and the same applies to mortal sin, as stated (ad 1).

Reply Obj. 3: A disposition may be related in three ways to that to which it disposes: for sometimes it is the same thing and is in the same subject; thus inchoate science is a disposition to perfect science: sometimes it is in the same subject, but is not the same thing; thus heat is a disposition to the form of fire: sometimes it is neither the same thing, nor in the same subject, as in those things which are subordinate to one another in such a way that we can arrive at one through the other, e.g. goodness of the imagination is a disposition to science which is in the intellect. In this way the venial sin that is in the sensuality, may be a disposition to mortal sin, which is in the reason.

________________________

FIFTH ARTICLE [I-II, Q. 74, Art. 5]

Whether Sin Can Be in the Reason?

Objection 1: It would seem that sin cannot be in the reason. For the sin of any power is a defect thereof. But the fault of the reason is not a sin, on the contrary, it excuses sin: for a man is excused from sin on account of ignorance. Therefore sin cannot be in the reason.

Obj. 2: Further, the primary object of sin is the will, as stated above (A. 1). Now reason precedes the will, since it directs it.

Therefore sin cannot be in the reason.

Obj. 3: Further, there can be no sin except about things which are under our control. Now perfection and defect of reason are not among those things which are under our control: since by nature some are mentally deficient, and some shrewd-minded. Therefore no sin is in the reason.

_On the contrary,_ Augustine says (De Trin. xii, 12) that sin is in the lower and in the higher reason.

_I answer that,_ The sin of any power is an act of that power, as we have clearly shown (AA. 1, 2, 3). Now reason has a twofold act: one is its proper act in respect of its proper object, and this is the act of knowing the truth; the other is the act of reason as directing the other powers. Now in both of these ways there may be sin in the reason. First, in so far as it errs in the knowledge of truth, which error is imputed to the reason as a sin, when it is in ignorance or error about what it is able and ought to know: secondly, when it either commands the inordinate movements of the lower powers, or deliberately fails to check them.

Reply Obj. 1: This argument considers the defect in the proper act of the reason in respect of its proper object, and with regard to the case when it is a defect of knowledge about something which one is unable to know: for then this defect of reason is not a sin, and excuses from sin, as is evident with regard to the actions of madmen.