De toutes les définitions de l'homme, la plus mauvaise me paraît celle qui en fait un animal raisonnable. - Anatole France

Il est à peu près impossible de constituer systématiquement une morale naturelle. La nature n'a pas de principes. Elle ne nous fournit aucune raison de croire que la vie humaine est respectable. La nature, indifférente, ne fait nulle distinction du bien et du mal.

Nature teaches us to devour each other and gives us the example of all the crimes and all the vices which the social state corrects or conceals. We should love virtue; but it is well to know that this is simply and solely a convenient expedient invented by men in order to live comfortably together. What we call morality is merely a desperate enterprise, a forlorn hope, on the part of our fellow creatures to reverse the order of the universe, which is strife and murder, the blind interplay of hostile forces. She destroys herself, and the more I think of things, the more convinced I am that the universe is mad. Theologians and philosophers, who make God the author of Nature and the architect of the universe, show Him to us as illogical and ill-conditioned. They declare Him benevolent, because they are afraid of Him, but they are forced to admit that His acts are atrocious. They attribute a malignity to him seldom to be found even in mankind. And that is how they get human beings to adore Him. For our miserable race would never lavish worship on just and benevolent deities from which they would have nothing to fear; they would feel only a barren gratitude for their benefits. Without purgatory and hell, your good God would be a mighty poor creature.

For our miserable species would never lavish worship on a just and benevolent God from whom they had nothing to fear; they would only feel an empty and thankless gratitude for their benefits. Without purgatory and hell, your God would indeed be a useless creature.