“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.”

“The soul of this man is his clothes.”

“Let me be that I am and seek not to alter me.”

“If I had my mouth, I would bite; if I had my liberty, I would do my liking. In the meantime, let me be that I am, and seek not toalter me.”

“How sharper than a serpent's tooth it is to have a thankless child!”

“It is a wise father that knows his own child.”

“If it be you that stirs these daughters' heartsAgainst their father, fool me not so muchTo bear it tamely; touch me with noble anger,And let not women's weapons, water drops,Stain my man's cheeks.”

“While 9-5 and what happens on the job is important, what happens from 5-9, off the job, is infinitely more important.”

“My most brilliant achievement was my ability to be able to persuade my wife to marry me.”

“I let people fill in the blanks on their own. If they want to think about their ex, that's fine. If they want to think about maybe who one of my exes is, then that's fine. And it might not be right, because I'm the only one who knows what these songs are really about. It's the one shred of privacy I have in the matter.”