Sorry, investing was pretty boring and I really missed being part of building something. I felt like I was always standing on the sidelines, so Zappos... really liked the people there and got involved full-time and I've been full-time ever since.

I think a much better use of time and resources is to really focus on your existing users or customers and figure out what changes can you make in the Web site, the service, the product, whatever, to get them to come back more often to generate that repeat business and once you kind of figure out that formula, then when you get new customers the whole thing just kind of grows exponentially.

Launching a business is kind of like a motorboat: You can go very quickly and turn fast.

A bigger business is like a cruise ship: There are lots of amenities and you can go a lot further, but it's harder to turn quickly.

Your culture is your brand.

Having a higher purpose is more than just about profits. You actually end up making more profits in the long run because employees really are a lot more engaged and customers see the higher purpose in the company.

Happiness is really just about four things: perceived control, perceived progress, connectedness (number and depth of your relationships), and vision/meaning (being part of something bigger than yourself).