There are thousands of years in the past, and there is an unknown amount of time in the future. There are all kinds of opportunities, and there are all kinds of dangers. Man has been stopped before by stopping his ideas. Man has been jammed for long periods of time. We will not tolerate this. I hope for freedom for future generations - freedom to doubt, to develop, to continue the adventure of finding new ways of doing things, of solving problems.
-Richard Feynman, The Meaning Of It All: Thoughts of a Citizen-Scientist