“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.”

“For my part, I will never give up, and I mean never.”

“Sound trumpets! Let our bloody colours wave! And either victory, or else a grave.”

“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.”

“By heaven, I'll make a ghost of him that lets me.”

“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.”

“Much rain wears the marble.”

“Though patience be a tired mare, yet she will plod.”

“Perseverance... keeps honor bright: to have done, is to hang quite out of fashion, like a rusty nail in monumental mockery.”