That's if you define optimism to be belief in sustained human progress, and redefine pessimism as realism (reality is a mixed bag) If you go with someone else'

That's if you define optimism to be belief in sustained human progress, and redefine pessimism as realism (reality is a mixed bag) If you go with someone else's definition, pessimism could be belief in ubiquitous, sustained human failure, while optimism is recognizing that failure may come, but won't indefinitely or all the time (reality is a mixed bag)