When superstition is allowed to perform the task of old age in dulling the human temperament, we can say goodbye to all excellence in poetry, in painting, and in music.

It is very important not to mistake hemlock for parsley, but to believe or not believe in God is not important at all.

If you want me to believe in God, you must make me touch him.

In order to shake a hypothesis, it is sometimes not necessary to do anything more than push it as far as it will go.

Morals are in all countries the result of legislation and government; they are not African or Asian or European: they are good or bad.

It is not human nature we should accuse but the despicable conventions that pervert it.

Every man has his dignity. I'm willing to forget mine, but at my own discretion and not when someone else tells me to.

Evil always turns up in this world through some genius or other.