The universe is so immense that it appears immutable, and that the duration of a planet such as that of the earth is only a chapter, less than that, a phrase, less still, only a word of the universe’s history.

Men have had the vanity to pretend that the whole creation was made for them, while in reality the whole creation does not suspect their existence.

What, then, is this blue sky, which certainly does exist, and which veils from us the stars during the day?

The supernatural does not exist.

If the existence of human beings leads to nothing, what is all this comedy about?

Lightning seems a thought, which instead of being attached to a brain, is attached to an electric current.

The present inhabitation of Mars be a race superior to ours is very probable.