Voltaire's Philosophical Dictionary · Voltaire
ANSWER
All this supposition seems to me prodigiously fantastic, for two reasons; first, that in this universe there are intelligent beings, and that you would not know how to prove it possible for movement alone to produce understanding; second, that, from your own avowal, there is infinity against one to bet, that an intelligent creative cause animates the universe. When one is alone face to face with the infinite, one feels very small. Again, Spinoza himself admits this intelligence; it is the basis of his system. You have not read it, and it must be read. Why do you want to go further than him, and in foolish arrogance plunge your feeble reason in an abyss into which Spinoza dared not descend? Do you realize thoroughly the extreme folly of saying that it is a blind cause that arranges that the square of a planet's revolution is always to the square of the revolutions of other planets, as the cube of its distance is to the cube of the distances of the others to the common centre? Either the heavenly bodies are great geometers, or the Eternal Geometer has arranged the heavenly bodies. But where is the Eternal Geometer? is He in one place or in all places, without occupying space? I have no idea. Is it of His own substance that He has arranged all things? I have no idea. Is He immense without quantity and without quality? I have no idea. All that I know is that one must worship Him and be just.
Can one say that the parts of animals conform to their needs: what are these needs? preservation and propagation. Is it astonishing then that, of the infinite combinations which chance has produced, there has been able to subsist only those that have organs adapted to the nourishment and continuation of their species? have not all the others perished of necessity? This objection, oft-repeated since Lucretius, is sufficiently refuted by the gift of sensation in animals, and by the gift of intelligence in man. How should combinations "which chance has produced," produce this sensation and this intelligence (as has just been said in the preceding paragraph)? Without any doubt the limbs of animals are made for their needs with incomprehensible art, and you are not so bold as to deny it. You say no more about it. You feel that you have nothing to answer to this great argument which nature brings against you. The disposition of a fly's wing, a snail's organs suffices to bring you to the ground. Modern natural philosophers have but expanded these so-called arguments, often they have pushed them to trifling and indecency. They have found God in the folds of the skin of the rhinoceros: one could, with equal reason, deny His existence because of the tortoise's shell. What reasoning! The tortoise and the rhinoceros, and all the different species, are proof equally in their infinite variety of the same cause, the same design, the same aim, which are preservation, generation and death.
There is unity in this infinite variety; the shell and the skin bear witness equally. What! deny God because shell does not resemble leather! And journalists have been prodigal of eulogies about these ineptitudes, eulogies they have not given to Newton and Locke, both worshippers of the Deity who spoke with full knowledge. Of what use are beauty and proportion in the construction of the snake? They may have uses, some say, of which we are ignorant. At least let us be silent then; let us not admire an animal which we know only by the harm it does.
Text from Project Gutenberg, public domain in the United States.