" And this is one of the first things one learns from Musk’s example—he is relentless in his pursuit of the bold and, the bigger point, totally unfazed by scale. When he couldn’t get a job, he started a company. When Internet commerce stalled, he reinvented banking. When he couldn’t find decent launch services for his Martian greenhouse, he went into the rocket business. And as a kicker, because he never lost interest in the problem of energy, he started both an electric car and a solar energy company. It is also worth pointing out that Tesla is the first successful car company started in America in five decades and that SolarCity has become one of the nation’s largest residential solar providers.9 All told, in slightly less than a dozen years, Musk’s appetite for bold has created an empire worth about $30 billion.10 So what’s his secret? Musk has a few, but none are more important to him than passion and purpose. “I didn’t go into the rocket business, the car business, or the solar business thinking this is a great opportunity. I just thought, in order to make a difference, something needed to be done. I wanted to have an impact. I wanted to create something substantially better than what came before. "

― Peter H. Diamandis , Bold: How to Go Big, Create Wealth and Impact the World