“I will be the first to admit that I am a pessimist by nature. It is, after all, the wisest way to be. We pessimists have everything to gain, whereas optimists have a fifty-fifty chance of being disappointed.”
“I am by nature an optimist and by intellectual conviction a pessimist.”
“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.”
“I am neither an optimist nor pessimist, but a possibilist.”
“Pessimists are usually right and optimists are usually wrong but all the great changes have been accomplished by optimists.”
“I am an optimist, unrepentant and militant. After all, in order not to be a fool, an optimist must know what a sad place the world can be. It is only the pessimist who finds this out anew every day.”