Over the last ten years, technological advances have dramatically lowered the financial bar for starting a new company, but the courage bar for building a great company remains as high as it has ever been.

Groupon looked like a very high valuation, but any investment in a great company at any stage is almost always a good investment.

Don't punk out and don't quit.

Breakthrough ideas usually come from guys who look like they're hallucinating

The bigger you get, the harder this gets because the more aggressive the people working for you are.

In my experience as CEO, I found that the most important decisions tested my courage far more than my intelligence.

There are no silver bullets.