Why do we grapple with problems? We are only in the beginning. We have plenty of time to solve the problems. The only way that we will make a mistake is that in the impetuous youth of humanity we will decide we know the answer. This is it. Not one else can think of anything else. And we will jam. We will confine man to the limited imagination of today's human beings.
-Richard P. Feynman, The Meaning Of It All: Thoughts of a Citizen-Scientist