Prima Secundæ, Question 13 — Summa Theologiae
Article 1. Whether choice is an act of will or of reason?
Objection 1. It would seem that choice is an act, not of will but of reason. For choice implies comparison, whereby one is given preference to another. But to compare is an act of reason. Therefore choice is an act of reason.
Objection 2. Further, it is for the same faculty to form a syllogism, and to draw the conclusion. But, in practical matters, it is the reason that forms syllogisms. Since therefore choice is a kind of conclusion in practical matters, as stated in Ethic. vii, 3, it seems that it is an act of reason.
Objection 3. Further, ignorance does not belong to the will but to the cognitive power. Now there is an “ignorance of choice,” as is stated in Ethic. iii, 1. Therefore it seems that choice does not belong to the will but to the reason.
On the contrary, The Philosopher says (Ethic. iii, 3) that choice is “the desire of things in our power.” But desire is an act of will. Therefore choice is too.
I answer that, The word choice implies something belonging to the reason or intellect, and something belonging to the will: for the Philosopher says (Ethic. vi, 2) that choice is either “intellect influenced by appetite or appetite influenced by intellect.” Now whenever two things concur to make one, one of them is formal in regard to the other. Hence Gregory of Nyssa [Nemesius, De Nat. Hom. xxxiii.] says that choice “is neither desire only, nor counsel only, but a combination of the two. For just as we say that an animal is composed of soul and body, and that it is neither a mere body, nor a mere soul, but both; so is it with choice.”
Now we must observe, as regards the acts of the soul, that an act belonging essentially to some power or habit, receives a form or species from a higher power or habit, according as an inferior is ordained by a superior: for if a man were to perform an act of fortitude for the love of God, that act is materially an act of fortitude, but formally, an act of charity. Now it is evident that, in a sense, reason precedes the will and ordains its act: in so far as the will tends to its object, according to the order of reason, since the apprehensive power presents the object to the appetite. Accordingly, that act whereby the will tends to something proposed to it as being good, through being ordained to the end by the reason, is materially an act of the will, but formally an act of the reason. Now in such like matters the substance of the act is as the matter in comparison to the order imposed by the higher power. Wherefore choice is substantially not an act of the reason but of the will: for choice is accomplished in a certain movement of the soul towards the good which is chosen. Consequently it is evidently an act of the appetitive power.
Reply to Objection 1. Choice implies a previous comparison; not that it consists in the comparison itself.
Reply to Objection 2. It is quite true that it is for the reason to draw the conclusion of a practical syllogism; and it is called “a decision” or “judgment,” to be followed by “choice.” And for this reason the conclusion seems to belong to the act of choice, as to that which results from it.
Reply to Objection 3. In speaking “of ignorance of choice,” we do not mean that choice is a sort of knowledge, but that there is ignorance of what ought to be chosen.
Article 2. Whether choice is to be found in irrational animals?
Objection 1. It would seem that irrational animals are able to choose. For choice “is the desire of certain things on account of an end,” as stated in Ethic. iii, 2,3. But irrational animals desire something on account of an end: since they act for an end, and from desire. Therefore choice is in irrational animals.
Objection 2. Further, the very word “electio” [choice] seems to signify the taking of something in preference to others. But irrational animals take something in preference to others: thus we can easily see for ourselves that a sheep will eat one grass and refuse another. Therefore choice is in irrational animals.
Objection 3. Further, according to Ethic. vi, 12, “it is from prudence that a man makes a good choice of means.” But prudence is found in irrational animals: hence it is said in the beginning of Metaph. i, 1 that “those animals which, like bees, cannot hear sounds, are prudent by instinct.” We see this plainly, in wonderful cases of sagacity manifested in the works of various animals, such as bees, spiders, and dogs. For a hound in following a stag, on coming to a crossroad, tries by scent whether the stag has passed by the first or the second road: and if he find that the stag has not passed there, being thus assured, takes to the third road without trying the scent; as though he were reasoning by way of exclusion, arguing that the stag must have passed by this way, since he did not pass by the others, and there is no other road. Therefore it seems that irrational animals are able to choose.
On the contrary, Gregory of Nyssa [Nemesius, De Nat. Hom. xxxiii.] says that “children and irrational animals act willingly but not from choice.” Therefore choice is not in irrational animals.
I answer that, Since choice is the taking of one thing in preference to another it must of necessity be in respect of several things that can be chosen. Consequently in those things which are altogether determinate to one there is no place for choice. Now the difference between the sensitive appetite and the will is that, as stated above (I-II:1:2 ad 3), the sensitive appetite is determinate to one particular thing, according to the order of nature; whereas the will, although determinate to one thing in general, viz. the good, according to the order of nature, is nevertheless indeterminate in respect of particular goods. Consequently choice belongs properly to the will, and not to the sensitive appetite which is all that irrational animals have. Wherefore irrational animals are not competent to choose.
Reply to Objection 1. Not every desire of one thing on account of an end is called choice: there must be a certain discrimination of one thing from another. And this cannot be except when the appetite can be moved to several things.
Reply to Objection 2. An irrational animal takes one thing in preference to another, because its appetite is naturally determinate to that thing. Wherefore as soon as an animal, whether by its sense or by its imagination, is offered something to which its appetite is naturally inclined, it is moved to that alone, without making any choice. Just as fire is moved upwards and not downwards, without its making any choice.
Reply to Objection 3. As stated in Phys. iii, 3 “movement is the act of the movable, caused by a mover.” Wherefore the power of the mover appears in the movement of that which it moves. Accordingly, in all things moved by reason, the order of reason which moves them is evident, although the things themselves are without reason: for an arrow through the motion of the archer goes straight towards the target, as though it were endowed with reason to direct its course. The same may be seen in the movements of clocks and all engines put together by the art of man. Now as artificial things are in comparison to human art, so are all natural things in comparison to the Divine art. And accordingly order is to be seen in things moved by nature, just as in things moved by reason, as is stated in Phys. ii. And thus it is that in the works of irrational animals we notice certain marks of sagacity, in so far as they have a natural inclination to set about their actions in a most orderly manner through being ordained by the Supreme art. For which reason, too, certain animals are called prudent or sagacious; and not because they reason or exercise any choice about things. This is clear from the fact that all that share in one nature, invariably act in the same way.