History is the autobiography of a madman.

Science even more than the Gospel teaches us humility. She cannot look down on anything, she does not know what superiority means, she despises nothing, never lies for the sake of a pose, and conceals nothing out of coquetry. She stops before the facts as an investigator, sometimes as a physician, never as an executioner, and still less with hostility and irony.

Life has taught me to think, but thinking has not taught me to live.

One must open men's eyes, not tear them out.

I believe in nothing here, except a handful of people, a few ideas, and the fact that one cannot arrest movement.

The world will not know liberty until all that is religious and political is transformed into something simple and human and made susceptible to criticism and denial.

You can no more bridle passions with logic than you can justify them in the law courts. Passions are facts and not dogmas.