‘A tennis-ball, whether in motion by the stroke of a racket, or lying still at rest, is not by any one taken to be a free agent. If we inquire into the reason, we shall find it is because we conceive not a tennis-ball to think; and consequently not to have any volition, or preference of motion to rest or _vice versâ_; and therefore has not liberty, is not a free agent, but both its motion and rest come under our idea of necessity, and are so called. Likewise a man falling into the water (a bridge breaking under him) has not herein liberty, is not a free agent. For though he has volition, though he prefers his not falling to falling, yet the forbearance of that motion not being in his power, the stop or cessation of that motion follows not upon his volition; and therefore therein he is not free. So a man striking himself or his friend by a convulsive motion of his arm, no body thinks he has in this liberty, every one pities him as acting by necessity and constraint.’ Here I will just stop to observe that the stanch sticklers for necessity, who make up by an excess of zeal for their want of knowledge, would read this passage with a smile of self-complacent contempt, and remark profoundly that whether the man struck his friend on purpose, or from a convulsive motion, he was equally under necessity, and the object of pity. Now whether he is an object of pity, I shall not dispute; but I conceive he is also an object of anger in the one case which he is not in the other, because anger will prevent a man’s striking you again, but will not cure him of St. Vitus’s dance. It is to this sort of indiscriminate, blind, senseless necessity which neutralizes all things and actions, and under the pretence of establishing the operation of causes, destroys the distinction between the different degrees and kinds of necessity, to which I do not profess myself a convert. To return.—‘As it is in the motions of the body,’ proceeds Mr. Locke, ‘so it is in the thoughts of our minds: where any one is such, that we have power to take it up or lay it by, according to the preference of the mind, there we are at liberty. Yet some ideas to the mind, like some motions to the body, are such as in certain circumstances it cannot avoid, nor obtain their absence by the utmost effort it can use. A man on the rack is not at liberty to lay by the idea of pain, and divert himself with other contemplations. And sometimes a boisterous passion hurries our thoughts, as a hurricane does our bodies, without leaving us the liberty of thinking on other things which we would rather choose. But as soon as the mind regains the power to stop or continue, begin or forbear any of these motions of the body without, or of the mind within, according as it thinks fit to prefer either to the other, we then consider the man as free again.’