Summa Theologica

We must now consider the different acts of the will; and in the first place, those acts which belong to the will itself immediately, as being elicited by the will; secondly, those acts which are commanded by the will.

Now the will is moved to the end, and to the means to the end; we must therefore consider: (1) those acts of the will whereby it is moved to the end; and (2) those whereby it is moved to the means. And since it seems that there are three acts of the will in reference to the end; viz. "volition," "enjoyment," and "intention"; we must consider: (1) volition; (2) enjoyment; (3) intention. Concerning the first, three things must be considered: (1) Of what things is the will? (2) By what is the will moved? (3) How is it moved?

Under the first head there are three points of inquiry:

(1) Whether the will is of good only?

(2) Whether it is of the end only, or also of the means?

(3) If in any way it be of the means, whether it be moved to the end and to the means, by the same movement?