The safest course is to do nothing against one's conscience. With this secret, we can enjoy life and have no fear from death.

As you know, the Inquisition is an admirable and wholly Christian invention to make the pope and the monks more powerful and turn a whole kingdom into hypocrites.

There is only one morality, as there is only one geometry.

Which is more dangerous: fanaticism or atheism? Fanaticism is certainly a thousand times more deadly; for atheism inspires no bloody passion whereas fanaticism does; atheism is opposed to crime and fanaticism causes crimes to be committed.

Man is free at the instant he wants to be.

Men argue. Nature acts.

God created women only to tame men.