“I am fundamentally an optimist. Whether that comes from nature or nurture, I cannot say. Part of being optimistic is keeping one's head pointed toward the sun, one's feet moving forward. There were many dark moments when my faith in humanity was sorely tested, but I would not and could not give myself up to despair. That way lays defeat and death.”
“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.”
“If I were asked to give what I consider the single most useful bit of advice for all humanity, it would be this: Expect trouble as an inevitable part of life, and when it comes, hold your head high. Look it squarely in the eye, and say, 'I will be bigger than you. You cannot defeat me.”
“I cannot be an optimist but I am a prisoner of hope.”
“Of all the pessimistic people, I am the most optimistic. I look forward to looking down on all the people looking up to me for answers from below.”
“I am by nature an optimist and by intellectual conviction a pessimist.”