Tech stocks are trading at a 30-year-low when compared to the multiples of industrials (companies). Its the weirdest bubble when everyone hates everything.

If you think you can execute a previously failed idea, you just have to be able to show that now is the time.

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.

Skype has a great engineering team, which I like to describe as 'all of Estonia.'

There's always more demands than there's time to meet them, so it's constantly a matter of trying to balance them

More and more major industries are being run on software and delivered as online services—from movies to agriculture to national defense. Many of the winners are Silicon Valley-style entrepreneurial technology companies that are invading and overturning established industry structures. Over the next 10 years, I expect many more industries to be disrupted by software, with new world-beating Silicon Valley companies doing the disruption in more cases than not.

You only ever experience two emotions: euphoria and terror. And I find that lack of sleep enhances them both.