“I think that's the single best piece of advice: constantly think about how you could be doing things better and questioning yourself.”

“It's not as though we can keep burning coal in our power plants. Coal is a finite resource, too. We must find alternatives, and it's a better idea to find alternatives sooner then wait until we run out of coal, and in the meantime, put God knows how many trillions of tons of CO2 that used to be buried underground into the atmosphere.”

“Great companies are built on great products.”

“I had so many people try to talk me out of starting a rocket company, it was crazy.”

“I've been to Disneyland, like, 10 times. I'm getting really tired of Disneyland.”

“May it not also be that the cause of civilization itself will be defended by the skill and devotion of a few thousand airmen? There never has been, I suppose, in all the world, in all the history of war, such an opportunity for youth. The Knights of the Round Table, the Crusaders, all fall back into the past.”

“It is apparent to me that the possibilities of the aeroplane, which two or three years ago were thought to hold the solution to the [flying machine] problem, have been exhausted, and that we must turn elsewhere.”

“So I got off the plane and I forget to take off my seat-belt and I'm dragging the plane through the terminal... The wings are knocking people over.”