Summa Theologica, Part I-II (Pars Prima Secundae) / From the Complete American Edition

by Saint Aquinas Thomas

Reply Obj. 1: It is not in respect of the same that the will moves itself and is moved: wherefore neither is it in act and in potentiality in respect of the same. But forasmuch as it actually wills the end, it reduces itself from potentiality to act, in respect of the means, so as, in a word, to will them actually.

Reply Obj. 2: The power of the will is always actually present to itself; but the act of the will, whereby it wills an end, is not always in the will. But it is by this act that it moves itself. Accordingly it does not follow that it is always moving itself.

Reply Obj. 3: The will is moved by the intellect, otherwise than by itself. By the intellect it is moved on the part of the object: whereas it is moved by itself, as to the exercise of its act, in respect of the end. ________________________

FOURTH ARTICLE [I-II, Q. 9, Art. 4]

Whether the Will Is Moved by an Exterior Principle?

Objection 1: It would seem that the will is not moved by anything exterior. For the movement of the will is voluntary. But it is essential to the voluntary act that it be from an intrinsic principle, just as it is essential to the natural act. Therefore the movement of the will is not from anything exterior.

Obj. 2: Further, the will cannot suffer violence, as was shown above (Q. 6, A. 4). But the violent act is one "the principle of which is outside the agent" [*Aristotle, Ethic. iii, 1]. Therefore the will cannot be moved by anything exterior.

Obj. 3: Further, that which is sufficiently moved by one mover, needs not to be moved by another. But the will moves itself sufficiently. Therefore it is not moved by anything exterior.

On the contrary, The will is moved by the object, as stated above (A. 1). But the object of the will can be something exterior, offered to the sense. Therefore the will can be moved by something exterior.

I answer that, As far as the will is moved by the object, it is evident that it can be moved by something exterior. But in so far as it is moved in the exercise of its act, we must again hold it to be moved by some exterior principle.