If you don't have the ability or encouragement to use yourself in a physical way, you could become just another talking head. And talking heads run things. That's part of the reason why we're in such a sad state as a planet, because it's all about thinking, and thinking has led to a lot of aggrandizement - taking over [resources] and figuring out how you can steal and leaving people and the planet in an impoverished state.
I do not know much about Mohammed or Mohammedanism. I do not take the Koran to bed with me every night. But, if I did on some one particular night, there is one sense at least in which I know what I should not find there. I apprehend that I should not find the work abounding in strong encouragements to the worship of idols; that the praises of polytheism would not be loudly sung; that the character of Mohammed would not be subjected to anything resembling hatred and derision; and that the great modern doctrine of the unimportance of religion would not be needlessly emphasised.
I believe that part of what propels science is the thirst for wonder. It's a very powerful emotion. All children feel it. In a first grade classroom everybody feels it; in a twelfth grade classroom almost nobody feels it, or at least acknowledges it. Something happens between first and twelfth grade, and it's not just puberty. Not only do the schools and the media not teach much skepticism, there is also little encouragement of this stirring sense of wonder. Science and pseudoscience both arouse that feeling. Poor popularizations of science establish an ecological niche for pseudoscience.
The encouragement I got from Campbell was a quick check and praise. Once the Space Beagle was launched on its mission, it seemed natural for it to breed additional thoughts.
Focusing your life solely on making a buck shows a certain poverty of ambition. It asks too little of yourself. Because it's only when you hitch your wagon to something larger than yourself that you realize your true potential.
One who has never known the turbulence of life, in whom the petals of the mysterious flower within have never opened; such a one may seem happy, may seem a saint, his single track mind may impress the multitude with its power - but he is ill equipped for life's true adventure into the infinite.