"The most dangerous people in the world are the ones who think they know what they’re doing."

"My dream—the solution—is that we would have a National Entrepreneur Day, with the following message: Most of you will fail, disrespected, impoverished, but we are grateful for the risks you are taking…"

"The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence."

"The only people who think that a billion dollars isn't enough are those who have at least a billion dollars."

"Some people are only funny when they try to be serious."