“For optimists, human life never needs justification, no matter how much hurt piles up, because they can always tell themselves that things will get better. For pessimists, there is no amount of happiness—should such a thing as happiness even obtain for human beings except as a misconception—that can compensate us for life’s hurt. As a worst-case example, a pessimist might refer to the hurt caused by some natural or human-made cataclysm. To adduce a hedonic counterpart to the horrors that attach to such cataclysms would require a degree of ingenuity from an optimist, but it could be done. And the reason it could be done, the reason for the eternal stalemate between optimists and pessimists, is that no possible formula can be established to measure proportions and types of hurt and happiness in the world. If such a formula could be established, then either pessimists or optimists would have to give in to their adversaries.”

“The point that in the absence of birth nobody exists who can be deprived of happiness is terribly conspicuous. For optimists, this fact plays no part in their existential computations. For pessimists, however, it is axiomatic. Whether a pessimist urges us to live “heroically” with a knife in our gut or denounces life as not worth living is immaterial. What matters is that he makes no bones about hurt being the Great Problem it is incumbent on philosophy to observe. But this problem can be solved only by establishing an imbalance between hurt and happiness that would enable us in principle to say which is more desirable—existence or nonexistence. While no airtight case has ever been made regarding the undesirability of human life, pessimists still run themselves ragged trying to make one. Optimists have no comparable mission. When they do argue for the desirability of human life it is only in reaction to pessimists arguing the opposite, even though no airtight case has ever been made regarding that desirability. Optimism has always been an undeclared policy of human culture—one that grew out of our animal instincts to survive and reproduce—rather than an articulated body of thought. It is the default condition of our blood and cannot be effectively questioned by our minds or put in grave doubt by our pains. This would explain why at any given time there are more cannibals than philosophical pessimists.”

“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.”

“Don't ever become a pessimist, Ira; a pessimist is correct oftener than an optimist, but an optimist has more fun--and neither can stop the march of events.”

“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.”