In every man there is something of all men.

So-called professional mathematicians have, in their reliance on the relative incapacity of the rest of mankind, acquired for themselves a reputation for profundity very similar to the reputation for sanctity possessed by theologians.

Why does a suppurating lung give so little warning and a sore on the finger so much?

Man can acquire accomplishments or he can become an animal, whichever he wants. God makes the animals, man makes himself.

Everyone is a genius at least once a year. The real geniuses simply have their bright ideas closer together.

Much can be inferred about a man from his mistress: in her one beholds his weaknesses and his dreams.

I ceased in the year 1764 to believe that one can convince one’s opponents with arguments printed in books. It is not to do that, therefore, that I have taken up my pen, but merely so as to annoy them, and to bestow strength and courage on those on our own side, and to make it known to the others that they have not convinced us.