Jeff Bezos

"If you're not stubborn, you'll give up on experiments too soon. And if you're not flexible, you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve."

"If you never want to be criticized, for goodness sake don't do anything new"

"I knew that if I failed I wouldn't regret that, but I knew the one thing I might regret is not trying."