Historian Howard Zinn wrote in an article for The Nation, called The Optimism of Uncertainty and I like his words.
"An optimist isn't necessarily a blithe, slightly sappy whistler in the dark of our time. To be hopeful in bad times is not just foolishly romantic. It is based on the fact that human history is a history not only of cruelty, but also of compassion, sacrifice, courage, kindness. What we choose to emphasize in this complex history will determine our lives. If we see only the worst, it destroys our capacity to do something. If we remember those times and places - and there are so many - where people have behaved magnificently, this gives us energy to act, and at least the possibility of sending this spinning top of a world in a different direction."