Doubt is not a very agreeable status, but certainty is a ridiculous one.

A physician is an unfortunate gentleman who is every day required to perform a miracle; namely to reconcile health with intemperance.

If one does not reflect, one thinks oneself master of everything; but when one does reflect, one realizes that one is master of nothing.

Every sensible man, every honorable man, must hold the Christian sect in horror.

A yawn may not be polite, but at least it is an honest opinion.

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

When he to whom one speaks does not understand, and he who speaks himself does not understand, that is Metaphysics.