Reply Obj. 1: We apply the word "voluntary" not only to that which proceeds from the will directly, as from its action; but also to that which proceeds from it indirectly as from its inaction.
Reply Obj. 2: "Not to wish" is said in two senses. First, as though it were one word, and the infinitive of "I-do-not-wish." Consequently just as when I say "I do not wish to read," the sense is, "I wish not to read"; so "not to wish to read" is the same as "to wish not to read," and in this sense "not to wish" implies involuntariness. Secondly it is taken as a sentence: and then no act of the will is affirmed. And in this sense "not to wish" does not imply involuntariness.
Reply Obj. 3: Voluntariness requires an act of knowledge in the same way as it requires an act of will; namely, in order that it be in one's power to consider, to wish and to act. And then, just as not to wish, and not to act, when it is time to wish and to act, is voluntary, so is it voluntary not to consider. ________________________
FOURTH ARTICLE [I-II, Q. 6, Art. 4]
Whether Violence Can Be Done to the Will?
Objection 1: It would seem that violence can be done to the will. For everything can be compelled by that which is more powerful. But there is something, namely, God, that is more powerful than the human will. Therefore it can be compelled, at least by Him.
Obj. 2: Further, every passive subject is compelled by its active principle, when it is changed by it. But the will is a passive force: for it is a "mover moved" (De Anima iii, 10). Therefore, since it is sometimes moved by its active principle, it seems that sometimes it is compelled.
Obj. 3: Further, violent movement is that which is contrary to nature. But the movement of the will is sometimes contrary to nature; as is clear of the will's movement to sin, which is contrary to nature, as Damascene says (De Fide Orth. iv, 20). Therefore the movement of the will can be compelled.
On the contrary, Augustine says (De Civ. Dei v, 10) that what is done by the will is not done of necessity. Now, whatever is done under compulsion is done of necessity: consequently what is done by the will, cannot be compelled. Therefore the will cannot be compelled to act.
I answer that, The act of the will is twofold: one is its immediate act, as it were, elicited by it, namely, "to wish"; the other is an act of the will commanded by it, and put into execution by means of some other power, such as "to walk" and "to speak," which are commanded by the will to be executed by means of the motive power.