in our being able to act or not to act, according as we shall choose or will.
28.

What Volition and action mean.
Secondly, we must remember, that VOLITION or WILLING is an act of the mind directing its thought to the production of any action, and thereby exerting its power to produce it.

To avoid multiplying of words, I would crave leave here, under the word ACTION, to comprehend the forbearance too of any action proposed: sitting still, or holding one's peace, when walking or speaking are proposed, though mere forbearances, requiring as much the determination of the will, and being as often weighty in their consequences, as the contrary actions, may, on that consideration, well enough pass for actions too: but this I say, that I may not be mistaken, if (for brevity's sake) I speak thus.
29.

What determines the Will.
Thirdly, the will being nothing but a power in the mind to direct the operative faculties of a man to motion or rest as far as they depend on such direction; to the question, What is it determines the will?
the true and proper answer is, The mind.

For that which determines the general power of directing, to this or that particular direction, is nothing but the agent itself exercising the power it has that particular way.