Except for some effects that I attribute mostly to age, my intuitive thinking is just as prone to overconfidence, extreme predictions, and the planning fallacy as it was before I made a study of these issues.

We think of our future as anticipated memories.

The planning fallacy is that you make a plan, which is usually a best-case scenario. Then you assume that the outcome will follow your plan, even when you should know better.

We don't see very far in the future, we are very focused on one idea at a time, one problem at a time, and all these are incompatible with rationality as economic theory assumes it.

We never would have built ClassPass if I hadn't learned so much from the Classtivity experience.

I've never been convinced that experience is linear, circular, or even random. It just is. I try to put it in some kind of order to extract meaning from it, to bring meaning to it.

As costs mount, in lives and dollars, it is natural to second guess, but one lesson I hope we have learned is that the U.S. cannot go it alone in a policy that leaves American troops taking all the risk and American taxpayers paying all of the costs.

In fact men will fight for a superstition quite as quickly as for a living truth - often more so, since a superstition is so intangible you cannot get at it to refute it, but truth is a point of view, and so is changeable.