On the contrary, Damascene says (De Fide Orth. ii, 22) that "if a man judge without affection for that of which he judges, there is no sentence," i.e. consent. But affection belongs to the appetitive power. Therefore consent does also.
I answer that, Consent implies application of sense to something. Now it is proper to sense to take cognizance of things present; for the imagination apprehends the similitude of corporeal things, even in the absence of the things of which they bear the likeness; while the intellect apprehends universal ideas, which it can apprehend indifferently, whether the singulars be present or absent. And since the act of an appetitive power is a kind of inclination to the thing itself, the application of the appetitive power to the thing, in so far as it cleaves to it, gets by a kind of similitude, the name of sense, since, as it were, it acquires direct knowledge of the thing to which it cleaves, in so far as it takes complacency in it. Hence it is written (Wis. 1:1): "Think of (Sentite) the Lord in goodness." And on these grounds consent is an act of the appetitive power.
Reply Obj. 1: As stated in De Anima iii, 9, "the will is in the reason." Hence, when Augustine ascribes consent to the reason, he takes reason as including the will.
Reply Obj. 2: Sense, properly speaking, belongs to the apprehensive faculty; but by way of similitude, in so far as it implies seeking acquaintance, it belongs to the appetitive power, as stated above.
Reply Obj. 3: Assentire (to assent) is, to speak, ad aliud sentire (to feel towards something); and thus it implies a certain distance from that to which assent is given. But consentire (to consent) is "to feel with," and this implies a certain union to the object of consent. Hence the will, to which it belongs to tend to the thing itself, is more properly said to consent: whereas the intellect, whose act does not consist in a movement towards the thing, but rather the reverse, as we have stated in the First Part (Q. 16, A. 1; Q. 27, A. 4; Q. 59, A. 2), is more properly said to assent: although one word is wont to be used for the other [*In Latin rather than in English.]. We may also say that the intellect assents, in so far as it is moved by the will. ________________________
SECOND ARTICLE [I-II, Q. 15, Art. 2]
Whether Consent Is to Be Found in Irrational Animals?
Objection 1: It would seem that consent is to be found in irrational animals. For consent implies a determination of the appetite to one thing. But the appetite of irrational animals is determinate to one thing. Therefore consent is to be found in irrational animals.
Obj. 2: Further, if you remove what is first, you remove what follows. But consent precedes the accomplished act. If therefore there were no consent in irrational animals, there would be no act accomplished; which is clearly false.
Obj. 3: Further, men are sometimes said to consent to do something, through some passion; desire, for instance, or anger. But irrational animals act through passion. Therefore they consent.