"The chief source of man's unhappiness is that he does not know how to stay quietly in his room."

"The only true wisdom is to know that you know nothing."

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

"Women are guilty of perjury far more often than men. It is questionable whether they ought to be allowed to take an oath at all."

"The more intelligent a man is, the more he suffers."