Men always fool themselves when they give up experience for systems born of the imagination. Man is the work of nature, he exists in nature, he is subject to its laws, he can not break free, he can not leave even in thought; it is in vain that his spirit wants to soar beyond the bounds of the visible world, he is always forced to return.

Religion has ever filled the mind of man with darkness, and kept him in ignorance of his real duties and true interests. It is by dispelling the clouds and phantoms of religion, that we shall discover truth, morality and reason. Religion diverts us from the causes of evils, and from these remedies which nature advocates, far from curing; it only aggravates, perpetuates and multiplies them.

Man cannot cherish his existence any longer than life holds out charms to him: when he is wrought upon by painful sensations, or drawn by contrary impulsions, his natural tendency is deranged; he is under the necessity to follow a new route; this conducts him to his end, which it even displays to him as the most desirable good.

If the ignorance of nature gave birth to gods, the knowledge of nature is calculated to destroy them.

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

When we examine the opinions of men, we find that nothing is more uncommon, than common sense; or, in other words, they lack judgment to discover plain truths, or to reject absurdities, and palpable contradictions.

Don't say anything about this to anybody. Any one would say that I am trying to play the good-natured philosopher. I am neither benefactor nor philosopher, but just a human being, and my charities are the pleasantest expense I have on these journeys.

Can theology give to the mind the ineffable boon of conceiving that which no man is in a capacity to comprehend? Can it procure to its agents the marvellous faculty of having precise ideas of a god composed of so many contradictory qualities?

All children are born Atheists; they have no idea of God.

If God be an infinite being, there cannot be, either in the present or future world, any relative proportion between man and his God. Thus, the idea of God can never enter the human mind.

Nature, you say, is totally inexplicable without a God. That is to say, to explain what you understand very little, you have need of a cause which you understand not at all.

The universe, that vast assemblage of every thing that exists, presents only matter and motion: the whole offers to our contemplation, nothing but an immense, an uninterrupted succession of causes and effects.

It is very strange that men should deny a Creator and yet attribute to themselves the power of creating eels.

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.

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.

Religion unites man with God, or forms a communication between them; yet do they not say, 'God is infinite?' If God be infinite, no finite being can have communication or relation with him.

When we examine the opinions of men, we find that nothing is more uncommon than common sense; or, in other words, they lack judgment to discover plain truths or to reject absurdities and palpable contradictions.

What, indeed, is an atheist? He is one who destroys delusions which are harmful to humanity in order to lead men back to nature, to reality, to reason. He is a thinker who, having reflected on the nature of matter, its energy, properties and ways of acting, has no need of idealized powers or imaginary intelligences to explain the phenomena of the universe and the operations of nature.

It is thus religion infatuates man from his infancy, fills him with vanity and fanaticism: if he has a heated imagination it drives him on to fury; if he has activity, it makes him a madman, who is frequently as cruel to himself, as he is dangerous and incommodious to others: if, on the contrary, he be phlegmatic or of a slothful habit, he becomes melancholy and is useless to society.

God, we are told, is willing to render himself inconsistent and ridiculous, to confound the curiosity of those whom, we are at the same time informed, he desires to enlighten by his special grace. What must we think of a revelation which, far from teaching us any thing, is calculated to darken and puzzle the clearest ideas?