The source of man's unhappiness is his ignorance of Nature.

In Nature nothing; is mean or contemptible, and it is only pride, originating in a false idea of our superiority, which causes our contempt for some of her productions. In the eyes of Nature, however, the oyster that vegetates at the bottom of the sea is as dear and perfect as the proud biped who devours it.

If we go back to the beginnings of things, we shall always find that ignorance and fear created the gods; that imagination, rapture and deception embellished them; that weakness worships them; that custom spares them; and that tyranny favors them in order to profit from the blindness of men.

Savage and furious nations, perpetually at war, adore, under diverse names, some God, conformable to their ideas, that is to say, cruel, carnivorous, selfish, blood-thirsty.

Tolerance and freedom of thought are the veritable antidotes to religious fanaticism.

Suns are extinguished or become corrupted, planets perish and scatter across the wastes of the sky; other suns are kindled, new planets formed to make their revolutions or describe new orbits, and man, an infinitely minute part of a globe which itself is only an imperceptible point in the immense whole, believes that the universe is made for himself.

The Jehovah of the Jews is a suspicious tyrant, who breathes nothing but blood, murder, and carnage, and who demands that they should nourish him with the vapours of animals. The Jupiter of the Pagans is a lascivious monster. The Moloch of the Phoenicians is a cannibal. The pure mind of the Christians resolved, in order to appease his fury, to crucify his own son. The savage god of the Mexicans cannot be satisfied without thousands of mortals which are immolated to his sanguinary appetite.