We have our hands, we have our brains, we have the challenge all around us, and we have within (from whatever source) the will to strive. That is enough; there is no need to assert 'belief' in that which we do not, as yet, know.
Robert A. HeinleinPessimist by policy, optimist by temperament- it is possible to be both. How? By never taking an unnecessary chance and by minimizing the risks you can't avoid. This permits you to play out the game untroubled by the certainty of the outcome.
Robert A. HeinleinOnce there was a race, quite unlike the human race - quite. I have no way of describing to you what they looked like or how they lived, but they had one characteristic you can understand: they were creative. The creating and enjoying of works of art was their occupation and their reason for being.
Robert A. Heinlein