"One must not let oneself be caught by surprise by death."

"There is something in the New York air that makes sleep useless."

"I tore myself away from the safe comfort of certainties through my love for truth - and truth was undoubtedly the highest mistress I ever served."

"Self-knowledge is no guarantee of happiness, but it is on the side of happiness and can supply the courage to fight for it."

"There is no such thing as a natural woman, because 'woman' is a historical product."