One of the keys to a successful life in any field is learning to take responsibility for ourselves, rather than waiting for someone else to do something for us.

It’s a bitter joke, but you’re right,” he said. “I suppose a species that all got along perfectly with each other would never make it to the stars, because they’d never argue enough to make their ideas work. And a species that thought everything through first wouldn’t get there because they’d never get around to it. So the galaxy will eventually be ruled by impetuous bickerers.

The sky is not the limit, because there are footsteps on the Moon.