Start-ups should be based on radical ideas. There should be a high failure rate for start-ups, because if there isn't their ideas aren't bold enough.

On the back end, software programming tools and Internet-based services make it easy to launch new global software-powered start-ups in many industries - without the need to invest in new infrastructure and train new employees.

At a certain point in your career - I mean, part of the answer is a personal answer, which is that at a certain point in your career, it becomes more satisfying to help entrepreneurs than to be one.

There's no such thing as the middle class. It's absolutely vanishing.

I think 2012 is the year when consumers all around the world start saying no to feature phones and start saying yes to smartphones.

Only two people have been on the cover of Time Magazine in bare feet. I'm one, the other is Gandhi.

Most of the big breakthrough technologies/companies seem crazy at first: PCs, the internet, Bitcoin, Airbnb, Uber, 140 characters.. It has to be a radical product. It has to be something where, when people look at it, at first they say, ‘I don’t get it, I don’t understand it. I think it’s too weird, I think it’s too unusual.’