“My mentality is that of a samurai. I would rather commit seppuku than fail.”

“I have made the mistaken assumption - and I will attempt to be better at this - of thinking that because somebody is on Twitter and is attacking me that it is open season. And that is my mistake.”

“I started SpaceX with the expectation of failure.”

“Even if producing CO2 was good for the environment, given that we're going to run out of hydrocarbons, we need to find some sustainable means of operating.”

“Optimism, pessimism, f**k that; we're going to make it happen. As God is my bloody witness, I'm hell-bent on making it work.”

“In science fiction, we dream. In order to colonize in space, to rebuild our cities, which are so far out of whack, to tackle any number of problems, we must imagine the future, including the new technologies that are required.”

“In our time the search for extraterrestrial life will eventually change our laws, our religions, our philosophies, our arts, our recreations, as well as our sciences. Space, the mirror, waits for life to come look for itself there.”

“We're going to become the martians when we land there. When we explore and build communities, we become the martians. That's a wonderful destiny for all of us.”

“...and then, in dreaming, / The clouds methought would open and show riches / Ready to drop upon me, that when I waked / I cried to dream again.”

“O, then I see Queen Mab hath been with you. . . . She is the fairies’ midwife, and she comes In shape no bigger than an agate stone On the forefinger of an alderman, Drawn with a team of little atomi Athwart men’s noses as they lie asleep.”

“For in that sleep of death what dreams may come.”

“My grief lies onward, and my joy behind.”

“O! that a man might know The end of this day's business, ere it come; But it sufficeth that the day will end, And then the end is known.”

“The bitter past, more welcome is the sweet.”