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.

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.

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

People have suffered and become insane for centuries by the thought of eternal punishment after death. Wouldn't it be better to depend on blind matter... than a god who puts out traps for people, invites them to sin, and allows them to sin and commit crimes he could prevent. Only to finally get the barbarian pleasure to punish them in an excessive way, of no use for himself, without them changing their ways and without their example preventing others from committing crimes.

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

All religions are ancient monuments to superstition, ignorance and ferocity.

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.