Note to self: It’s a good idea to ask, “What am I not doing?

I think theres a lot to be said about just enjoying your work. It can be very contrived when people say their work is for the good of mankind.

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

The one thing with stress is, you've got to keep your focus on what you can do, not what happened to you.

The primary thing that any technology startup must do is build a product that's at least 10 times better at doing something than the current prevailing way of doing that thing. Two or three times better will not be good enough to get people to switch to the new thing fast enough or in large enough volume to matter.

To succeed at selling a losing product, you must develop seriously superior sales techniques. In addition, you have to be massively competitive and incredibly hungry to survive in that environment.

As a startup CEO, I slept like a baby. I woke up every 2 hours and cried.