Make every detail perfect and limit the number of details to perfect.

Meet customers where they are; question how to make the tools customers use more valuable.

A number of people in the United States, almost everyone, is using plastic cards to pay for things, but it's extremely difficult to accept these cards. So let's make it's easy and take more and more of the friction out as we can.

Anything you're interested in the world whether it be Charlie rose or JetBlue or a public figure or your local coffee shop, they're on Twitter and broadcasting what is interesting to them.

Those words are from Lynda Barry's novel 'Cruddy.' I've carried them with me for some time. There's a lot in my life I wasn't expecting. One is the realization that I stood at this pulpit and delivered a reading for my own graduation...15 years ago. Unexpectedly, I'm old.

Twitter was around communication and visualizing what was happening in the world in real-time. Square was allowing everyone to accept the form of payment people have in their pocket today, which is a credit card.

Everyone has an idea, but it's really about executing the idea and attracting other people to help you with the idea.