"Working with him isn’t a comfortable experience, he is never satisfied with himself so he is never really satisfied with anyone around him. He pushes himself harder and harder and he pushes others around him the exact same way. The challenge is that he is a machine and the rest of us aren’t. So if you work for Elon you have to accept the discomfort. But in that discomfort is the kind of growth you can’t get anywhere else, and worth every ounce of blood and sweat."
https://www.quora.com/What-is-it-like-to-work-with-Elon-Musk
"Working with him isn’t a comfortable experience, he is never satisfied with himself so he is never really satisfied with anyone around him. He pushes himself harder and harder and he pushes others around him the exact same way. The challenge is that he is a machine and the rest of us aren’t. So if you work for Elon you have to accept the discomfort. But in that discomfort is the kind of growth you can’t get anywhere else, and worth every ounce of blood and sweat."