“A man may be a pessimistic determinist before lunch and an optimistic believer in the will's freedom after it.”
“The man who is a pessimist before 48 knows too much; if he is an optimist after it he knows too little.”
“The the question whether I am a pessimist or an optimist, I answer that my knowledge is pessimistic, but my willing and hope are optimistic.”
“The difference between an optimist and a pessimist? An optimist laughs to forget but a pessimist forgets to laugh.”
“Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute.”
“A pessimist is a man who thinks all women are bad. An optimist is a man who hopes they are.”