When it is said, that man is not a free agent, it is not pretended to compare him to a body moved by a simple impulsive cause: he contains within himself causes inherent to his existence; he is moved by an interior organ, which has its own peculiar laws; which is itself necessarily determined, in consequence of ideas formed from perceptions, resulting from sensations, which it receives from exterior objects. As the mechanism of these sensations, of these perceptions, and the manner they engrave ideas on the brain of man, are not known to him, because he is unable to unravel all these motions; because he cannot perceive the chain of operations in his soul, or the motive-principle that acts within him, he supposes himself a free agent; which, literally translated, signifies that he moves himself by himself; that he determines himself without cause; when he rather ought to say, he is ignorant how or for why he acts in the manner he does. It is true the soul enjoys an activity peculiar to itself, but it is equally certain that this activity would never be displayed if some motive or some cause did not put it in a condition to exercise itself, at least it will not be pretended that the soul is able either to love or to hate without being moved, without knowing the objects, without having some idea of their qualities. Gunpowder has unquestionably a particular activity, but this activity will never display itself, unless fire be applied to it; this, however, immediately sets in motion. It is the great complication of motion in man, it is the variety of his action, it is the multiplicity of causes that move him, whether simultaneously or in continual succession, that persuades him he is a free agent: if all his motions were simple, if the causes that move him did not confound themselves with each other, if they were distinct, if his machine was less complicated, he would perceive that all his actions were necessary, because he would be enabled to recur instantly to the cause that made him act. A man who should be always obliged to go towards the west would always go on that side, but he would feel extremely well, that in so going he was not a free agent: if he had another sense, as his actions or his motion augmented by a sixth would be still more varied, much more complicated, he would believe himself still more a free agent than he does with his five senses.