Life off Earth is in two important respects not at all unworldly: you can choose to focus on the surprises and pleasures, or the frustrations. And you can choose to appreciate the smallest scraps of experience, the everyday moments, or to value only the grandest, most stirring ones.

Success is feeling good about the work you do throughout the long, unheralded journey that May or may not wind up at the launch pad. You can’t view training solely as a stepping stone to something loftier. It’s got to be an end in itself.