102.
Man dies, and the human body after death is no longer anything but a mass incapable of producing those motions, of which the sum total constituted life. We see, that it has no longer circulation, respiration, digestion, speech, or thought. It is pretended, that the soul is then separated from the body; but to say, that this soul, with which we are unacquainted, is the principle of life, is to say nothing, unless that an unknown power is the hidden principle of imperceptible movements. Nothing is more natural and simple, than to believe, that the dead man no longer lives: nothing is more extravagant, than to believe, that the dead man is still alive. We laugh at the simplicity of some nations, whose custom is to bury provision with the dead, under an idea that it will be useful and necessary to them in the other life. Is it then more ridiculous or absurd to suppose, that men will eat after death, than to imagine, that they will think, that they will be actuated by agreeable or disagreeable ideas, that they will enjoy or suffer, and that they will experience repentance or delight, after the organs, adapted to produce sensations or ideas, are once dissolved. To say that the souls of men will be happy or unhappy after death, is in other words to say, that men will see without eyes, hear without ears, taste without palates, smell without noses, and touch without hands. And persons, who consider themselves very reasonable, adopt these ideas!
103.
The dogma of the immortality of the soul supposes the soul to be a simple substance; in a word, a spirit. But I ask again, what is a spirit? "It is," say you, "a substance void of extension, incorruptible, having nothing common with matter." If so, how is your soul born, and how does it grow, how does it strengthen or weaken itself, how does it get disordered and grow old, in the same progression as your body?
To all these questions you answer, that these are mysteries. If so, you cannot understand them. If you cannot understand them, why do you decide about a thing, of which you are unable to form the least idea? To believe or affirm any thing, it is necessary, at least, to know in what it consists. To believe in the existence of your immaterial soul, is to say, that you are persuaded of the existence of a thing, of which it is impossible for you to form any true notion; it is to believe in words without meaning. To affirm that the thing is as you say, is the height of folly or vanity.
104.
Are not theologians strange reasoners? Whenever they cannot divine the natural causes of things, they invent what they call supernatural; such as spirits, occult causes, inexplicable agents, or rather words, much more obscure than the things they endeavour to explain. Let us remain in nature, when we wish to account for the phenomena of nature; let us be content to remain ignorant of causes too delicate for our organs; and let us be persuaded, that, by going beyond nature, we shall never solve the problems which nature presents.