nothing of what they are in themselves or in relation to me. I study them, I observe them; and the first object which suggests itself for comparison with them is myself.
All that I perceive through the senses is matter, and I deduce all the essential properties of matter from the sensible qualities which make me perceive it, qualities which are inseparable from it. I see it sometimes in motion, sometimes at rest,64 hence I infer that neither motion nor rest is essential to it, but motion, being an action, is the result of a cause of which rest is only the absence. When, therefore, there is nothing acting upon matter it does not move, and for the very reason that rest and motion are indifferent to it, its natural state is a state of rest.
I perceive two sorts of motions of bodies, acquired motion and spontaneous or voluntary motion. In the first the cause is external to the body moved, in the second it is within. I shall not conclude from that that the motion, say of a watch, is spontaneous, for if no external cause operated upon the spring it would run down and the watch would cease to go. For the same reason I should not admit that the movements of fluids are spontaneous, neither should I attribute spontaneous motion to fire which causes their fluidity.65
You ask me if the movements of animals are spontaneous; my answer is, "I cannot tell," but analogy points that way. You ask me again, how do I know that there are spontaneous movements? I tell you, "I know it because I feel them." I want to move my arm and I move it without any other immediate cause of the movement but my own will. In vain would any one try to argue me out of this feeling, it is stronger than any proofs; you might as well try to convince me that I do not exist.
If there were no spontaneity in men's actions, nor in anything that happens on this earth, it would be all the more difficult to imagine a first cause for all motion. For my own part, I feel myself so thoroughly convinced that the natural state of matter is a state of rest, and that it has no power of action in itself, that when I see a body in motion I at once assume that it is either a living body or that this motion has been imparted to it. My mind declines to accept in any way the idea of inorganic matter moving of its own accord, or giving rise to any action.
Yet this visible universe consists of matter, matter diffused and dead,66 matter which has none of the cohesion, the organisation, the common feeling of the parts of a living body, for it is certain that we who are parts have no consciousness of the whole. This same universe is in motion, and in its movements, ordered, uniform, and subject to fixed laws, it has none of that freedom which appears in the spontaneous movements of men and animals. So the world is not some huge animal which moves of its own accord; its movements are therefore due to some external cause, a cause which I cannot perceive, but the inner voice makes this cause so apparent to me that I cannot watch the course of the sun without imagining a force which drives it, and when the earth revolves I think I see the hand that sets it in motion.
If I must accept general laws whose essential relation to matter is unperceived by me, how much further have I got? These laws, not being real things, not being substances, have therefore some other basis unknown to me. Experiment and observation have acquainted us with the laws of motion; these laws determine the results without showing their causes; they are quite inadequate to explain the system of the world and the course of the universe. With the help of dice Descartes made heaven and earth; but he could not set his dice in motion, nor start the action of his centrifugal force without the help of rotation. Newton discovered the law of gravitation; but gravitation alone would soon reduce the universe to a motionless mass; he was compelled to add a projectile force to account for the elliptical course of the celestial bodies; let Newton show us the hand that launched the planets in the tangent of their orbits.
The first causes of motion are not to be found in matter; matter receives and transmits motion, but does not produce it. The more I observe the action and reaction of the forces of nature playing on one another, the more I see that we must always go back from one effect to another, till we arrive at a first cause in some will; for to assume an infinite succession of causes is to assume that there is no first cause. In a word, no motion which is not caused by another motion can take place, except by a spontaneous, voluntary action; inanimate bodies have no action but motion, and there is no real action without will. This is my first principle. I believe, therefore, that there is a will which sets the universe in motion and gives life to nature. This is my first dogma, or the first article of my creed.
How does a will produce a physical and corporeal action? I cannot tell, but I perceive that it does so in myself; I will to do something and I do it; I will to move my body and it moves, but if an inanimate body, when at rest, should begin to move itself, the thing is incomprehensible and without precedent. The will is known to me in its action, not in its nature. I know this will as a cause of motion, but to conceive of matter as producing motion is clearly to conceive of an effect without a cause, which is not to conceive at all.
It is no more possible for me to conceive how my will moves my body than to conceive how my sensations affect my mind. I do not even know why one of these mysteries has seemed less inexplicable than the other. For my own part, whether I am active or passive, the means of union of the two substances seem to me absolutely incomprehensible. It is very strange that people make this very incomprehensibility a step towards the compounding of the two substances, as if operations so different in kind were more easily explained in one case than in two.
The doctrine I have just laid down is indeed obscure; but at least it suggests a meaning and there is nothing in it repugnant to reason or experience; can we say as much of materialism? Is it not plain that if motion is essential to matter it would be inseparable from it, it would always be present in it in the same degree, always present in every particle of matter, always the same in each particle of matter, it would not be capable of transmission, it could neither increase nor diminish, nor could we ever conceive of matter at rest. When you tell me that motion is not essential to matter but necessary to it, you try to cheat me with words which would be easier to refute if there was a little more sense in them. For either the motion of matter arises from the matter itself and is therefore essential to it; or it arises from an external cause and is not necessary to the matter, because the motive cause acts upon it; we have got back to our original difficulty.
The chief source of human error is to be found in general and abstract ideas; the jargon of metaphysics has never led to the discovery of any single truth, and it has filled philosophy with absurdities of which we are ashamed as soon as we strip them of their long words. Tell me, my friend, when they talk to you of a blind force diffused throughout nature, do they present any real idea to your mind? They think they are saying something by these vague expressions—universal force, essential motion—but they are saying nothing at all. The idea of motion is nothing more than the idea of transference from place to place; there is no motion without direction; for no individual can move all ways at once. In what direction then does matter move of necessity? Has the whole body of matter a uniform motion, or has each atom its own motion? According to the first idea the whole universe must form a solid and indivisible mass; according to the second it can only form a diffused and incoherent fluid, which would make the union of any two atoms impossible. What direction shall be taken by this motion common to all matter? Shall it be in a straight line, in a circle, or from above downwards, to the right or to the left? If each molecule has its own direction, what are the causes of all these directions and all these differences? If every molecule or atom only revolved on its own axis, nothing would ever leave its place and there would be no transmitted motion, and even then this circular movement would require to follow some direction. To set matter in motion by an abstraction is to utter words without meaning, and to attribute to matter a given direction is to assume a determining cause. The more examples I take, the more causes I have to explain, without ever finding a common agent which controls them. Far from being able to picture to myself an entire absence of order in the fortuitous concurrence of elements, I cannot even imagine such a strife, and the chaos of the universe is less conceivable to
