“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.”

“Be great in act, as you have been in thought.”

“My free drift Halts not particularly, but moves itself In a wide sea of wax; no levelled malice Infects one comma in the course I hold, But flies an eagle flight, bold and forth on, Leaving no tract behind.”

“Talking isn't doing. It is a kind of good deed to say well; and yet words are not deeds.”

“To be, or not to be, that is the question: Whether 'tis Nobler in the mind to suffer The Slings and Arrows of outrageous Fortune, Or to take Arms against a Sea of troubles, And by opposing end them: to die, to sleep No more; and by a sleep, to say we end The Heart-ache, and the thousand Natural shocks That Flesh is heir to? 'Tis a consummation Devoutly to be wished. To die to sleep, To sleep, perchance to Dream; Aye, there's the rub.”

“Yes, faith; it is my cousin's duty to make curtsy and say 'Father, as it please you.' But yet for all that, cousin, let him be a handsome fellow, or else make another curtsy and say 'Father, as it please me.”

“Tis in ourselves that we are thus, or thus.”

“Conflict cannot survive without your participation.”

“Where everyman is participator in the government of affairs, not merely at an election one day in the year but everyday, he will let the heart be torn out of his body sooner than his power be wrested from him by a Caesar or a Bonaparte.”

“Man ... feels that he is a participator in the government of affairs not merely at an election, one day in the year, but every day.”