Is there anything more surprising than the logic of so many profound doctors, who, instead of acknowledging the little light they have upon natural agencies, seek outside of nature—that is to say, in imaginary regions—an agent less understood than this nature, of which they can at least form some idea? To say that God is the author of the phenomena that we see, is it not attributing them to an occult cause? What is God? What is a spirit? They are causes of which we have no idea. Sages! study nature and her laws; and when you can from them unravel the action of natural causes, do not go in search of supernatural causes, which, very far from enlightening your ideas, will but entangle them more and more and make it impossible for you to understand yourselves.
XXXVIII—CONTINUATION.
Nature, you say, is totally inexplicable without a God; that is to say, in order to explain what you understand so little, you need a cause which you do not understand at all. You pretend to make clear that which is obscure, by magnifying its obscurity. You think you have untied a knot by multiplying knots. Enthusiastic philosophers, in order to prove to us the existence of a God, you copy complete treatises on botany; you enter into minute details of the parts of the human body; you ascend into the air to contemplate the revolutions of the stars; you return then to earth to admire the course of the waters; you fly into ecstasies over butterflies, insects, polyps, organized atoms, in which you think to find the greatness of your God; all these things will not prove the existence of this God; they will only prove that you have not the ideas which you should have of the immense variety of causes and effects that can produce the infinitely diversified combinations, of which the universe is the assemblage. This will prove that you ignore nature, that you have no idea of her resources when you judge her incapable of producing a multitude of forms and beings, of which your eyes, even by the aid of the microscope, see but the least part; finally, this will prove, that not being able to know the sensible and comprehensible agents, you find it easier to have recourse to a word, by which you designate an agent, of whom it will always be impossible for you to form any true idea.
XXXIX.—THE WORLD HAS NOT BEEN CREATED, AND MATTER MOVES BY ITSELF.
They tell us gravely that there is no effect without a cause; they repeat to us very often that the world did not create itself. But the universe is a cause, not an effect; it is not a work, has not been made, because it was impossible that it should be made. The world has always been, its existence is necessary. It is the cause of itself. Nature, whose essence is visibly acting and producing, in order to fulfill her functions, as we see she does, needs no invisible motor far more unknown than herself. Matter moves by its own energy, by the necessary result of its heterogeneity; the diversity of its movements or of its ways of acting, constitute only the diversity of substances; we distinguish one being from another but by the diversity of the impressions or movements which they communicate to our organs.
XL.—CONTINUATION.
You see that everything in nature is in a state of activity, and you pretend that nature of itself is dead and without energy! You believe that all this, acting of itself, has need of a motor! Well! who is this motor? It is a spirit, that is to say, an absolutely incomprehensible and contradictory being. Conclude then, I say to you, that matter acts of itself, and cease to reason about your spiritual motor, which has nothing that is necessary to put it into motion. Return from your useless excursions; come down from an imaginary into a real world; take hold of second causes; leave to theologians their "First Cause," of which nature has no need in order to produce all the effects which you see.