We have the ability to push much further than we think is possible, but the brain wants us to rest to allow the body to recover. With practice and training we can overcome almost any discomfort.

Today's consumer cares about what you stand for, and so having values and purpose are central to building that trust with your customer.

However, if the supply is infinite, (that's true of emails), then you're never actually going to get that position of mastery over time. What's going to happen is that you just get busier and busier and move faster and faster!

We formalized making sure that the company culture and the employee happiness was priority number one, and everything else — including profits, revenue growth, and so on — was a byproduct of getting the culture right. Because our whole belief was that if we get the culture right, then most of the other stuff, including building our brand to be about the very best customer service, will happen naturally on its own.

You may become rich, engage in philanthropy and help a million people but the only way you can help a billion people is by building a profitable business. If you can't make a profit, you can't help a billion people – so go make a profit!