On the contrary, Damascene says (De Fide Orth. ii, 22) that "after judging, man approves and embraces the judgment of his counselling, and this is called the sentence," i.e. consent. But counsel is not in irrational animals. Therefore neither is consent.
I answer that, Consent, properly speaking, is not in irrational animals. The reason of this is that consent implies an application of the appetitive movement to something as to be done. Now to apply the appetitive movement to the doing of something, belongs to the subject in whose power it is to move the appetite: thus to touch a stone is an action suitable to a stick, but to apply the stick so that it touch the stone, belongs to one who has the power of moving the stick. But irrational animals have not the command of the appetitive movement; for this is in them through natural instinct. Hence in the irrational animal, there is indeed the movement of the appetite, but it does not apply that movement to some particular thing. And hence it is that the irrational animal is not properly said to consent: this is proper to the rational nature, which has the command of the appetitive movement, and is able to apply or not to apply it to this or that thing.
Reply Obj. 1: In irrational animals the determination of the appetite to a particular thing is merely passive: whereas consent implies a determination of the appetite, which is active rather than merely passive.
Reply Obj. 2: If the first be removed, then what follows is removed, provided that, properly speaking, it follow from that only. But if something can follow from several things, it is not removed by the fact that one of them is removed; thus if hardening is the effect of heat and of cold (since bricks are hardened by the fire, and frozen water is hardened by the cold), then by removing heat it does not follow that there is no hardening. Now the accomplishment of an act follows not only from consent, but also from the impulse of the appetite, such as is found in irrational animals.
Reply Obj. 3: The man who acts through passion is able not to follow the passion: whereas irrational animals have not that power. Hence the comparison fails. ________________________
THIRD ARTICLE [I-II, Q. 15, Art. 3]
Whether Consent Is Directed to the End or to the Means?
Objection 1: It would seem that consent is directed to the end.
Because that on account of which a thing is such is still more such.
But it is on account of the end that we consent to the means.
Therefore, still more do we consent to the end.
Obj. 2: Further, the act of the intemperate man is his end, just as the act of the virtuous man is his end. But the intemperate man consents to his own act. Therefore consent can be directed to the end.
Obj. 3: Further, desire of the means is choice, as stated above (Q. 13, A. 1). If therefore consent were only directed to the means it would nowise differ from choice. And this is proved to be false by the authority of Damascene who says (De Fide Orth. ii, 22) that "after the approval" which he calls "the sentence," "comes the choice." Therefore consent is not only directed to the means.