"The only difference between a madman and me is that I am not mad."

"The general mistake is to suppose that we shall do something great in the future."

"If you want to know what a man is really like, take a good look at how he treats his inferiors, not his equals."

"The brain may be regarded as a kind of parasite of the organism, a pensioner, as it were, who dwells with the body."

"The doctor sees all the weakness of mankind; the lawyer all the wickedness, the theologian all the stupidity."