The general question is thus stated by Mr. Hobbes in the beginning of his treatise: the point is not, he says, ‘whether a man can be a free agent; that is to say, whether he can write or forbear, speak or be silent, according to his will, but whether the will to write, and the will to forbear, come upon him according to his will, or according to any thing else in his own power. I acknowledge this liberty, that I can do if I will; but to say—I can will if I will, I take to be an absurd speech. In fine, that freedom which men commonly find in books, that which the poets chaunt in the theatres, and the shepherds on the mountains, that which the pastors teach in the pulpits, and the doctors in the universities, and that which the common people in the markets, and all mankind in the whole world do assent unto, is the same that I assent unto, namely, that a man hath freedom to do if he will, but whether he hath freedom to will is a question neither the bishop nor they ever thought on.’ All in which I differ from Hobbes is, that I think there is a real freedom of choice and will, as well as of action, in the sense of the author, that is, not a freedom from necessity or causes in either case, but a liberty in any given agent to exert certain powers without being controlled or impeded in their exercise by another agent. Helvetius says, ‘It is true we can form a tolerably distinct idea of the word _liberty_, understood in a common sense. A man is free who is neither loaded with irons, nor confined in prison, nor intimidated like the slave by the dread of chastisement: in this sense, the liberty of a man consists in the free exercise of his power: I say of his power, because it would be ridiculous to mistake for a want of liberty the incapacity we are under to pierce the clouds like the eagle, to live under the water like the whale, or to become king, emperor, or pope. We have so far a sufficiently clear idea of the word. But this is no longer the case when we come to apply liberty to the will. What must this liberty then mean? We can only understand by it a free power of willing or not willing a thing: but this power would imply that there may be a will without motives, and consequently an effect without a cause. A philosophical treatise on the liberty of the will would be a treatise of effects without a cause.’—_Helvetius on the Mind_, p. 44.