Theological religion is the source of all imaginable follies and disturbances. It is the parent of fanaticism and civil discord; it is the enemy of mankind.

You despise books; you whose lives are absorbed in the vanities of ambition, the pursuit of pleasure or indolence; but remember that all the known world, excepting only savage nations, is governed by books.

What is not in nature can never be true.

Many are destined to reason wrongly; others, not to reason at all; and others, to persecute those who do reason.

Life is thickly sown with thorns. I know no other remedy than to pass rapidly over them. The longer we dwell on our misfortunes the greater is their power to harm us.

You are very harsh.' 'I have seen the world.

Everything's fine today, that is our illusion.