In order that knowledge be properly digested it must have been swallowed with a good appetite.

True education is the ability to discern the difference between what you do know and what you don't.

Distrust even Mathematics; albeit so sublime and highly perfected, we have here a machine of such delicacy it can only work in vacuo, and one grain of sand in the wheels is enough to put everything out of gear. One shudders to think to what disaster such a grain of sand may bring a Mathematical brain. Remember Pascal.

An old philosopher said to Monsieur Coignard, a Reverend Father: 'You are a pig!' To which Abad Coignard answered: 'You flatter me, sir. But unfortunately, I'm only a man.'

Truth possesses within herself a penetrating force, unknown alike to error and falsehood. I say 'truth' and you understand my meaning. For the beautiful words truth and justice need not to be defined in order to be understood in their true sense.

Custom alone regulates morals.

I am a physician. I keep a drug-shop of lies. I give relief, consolation. Can one console and relieve without lying? ... Only women and doctors know how necessary and how helpful lies are to men.