"I think frugality drives innovation, just like other constraints do. One of the only ways to get out of a tight box is to invent your way out."

"I want to make sure that we are always the most customer-centric company in the world."

"We are not competitors with bookstores. We are competitors with sleep."

"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…"

"You can have a good idea, but if you don't execute it well, it's not going to go anywhere."