Qualified software engineers, managers, marketers and salespeople in Silicon Valley can rack up dozens of high-paying, high-upside job offers any time they want, while national unemployment and underemployment is sky high

I always had the old-school model that I'm going to work for as long as I'm relevant and focus on for-profit activities and someday when I retire I'm going to learn about philanthropy.

I think that every technology company that's more than 20 years old will break up

In the startup world, you're either a genius or an idiot. You're never just an ordinary guy trying to get through the day

There will be certain points of time when everything collides together and reaches critical mass around a new concept or a new thing that ends up being hugely relevant to a high percentage of people or businesses. But it's really really hard to predict those. I don't believe anyone can.

Any new technology tends to go through a 25-year adoption cycle.

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.