I don't know Elon Musk and I've certainly not agreed with him in the past. Reading the above quote though brings a smile to my face, because every entrepreneur needs a healthy dose of arrogance to be successful.
I'm not talking about the arrogance that implies you're the best, that only you're able to achieve something or the kind of arrogance that makes you act like a prick within social contexts. Instead I'm talking about the bit of arrogance that enables you to be fearless, ambitious and willing to do your utmost to realize your dreams, even when others don't believe in you.