A thing is not proved just because no one has ever questioned it. What has never been gone into impartially has never been properly gone into. Hence scepticism is the first step toward truth. It must be applied generally, because it is the touchstone.

The best doctor is the one you run to and can't find.

There is only one passion, the passion for happiness.

Power acquired by violence is only a usurpation, and lasts only as long as the force of him who commands prevails over that of those who obey.

Only passions, great passions, can elevate the soul to great things.

Man will never be free until the last king is strangled with the entrails of the last priest.