The secret to successful hiring is this: look for the people who want to change the world.

I have failed a lot in my philanthropy, where I will make philanthropic contributions and they just won't be effective.

Once you know what you want and what is important for you to achieve, also define the values associated with it. What is important? That is something a lot of entrepreneurs pass by too quickly. For us, the things that were important were, No. 1, customer success. Nothing is more important to us than making sure every customer is successful in our service.

One problem we discovered, for example, was that our "create a new account" button was in the wrong place...By simply moving it to the left side, mirroring the way people read, we saw a huge improvement in the way people used the site.

Business requires an unbelievable level of resilience inside you, the chokehold on the growth of your business is always the leader, it's always your psychology and your skills - 80% psychology, 20% skills. If you don't have the marketing skills, if you don't have the financial-intelligence skills, if you don't have the recruiting skills, it's really hard for you to lead somebody else if you don't have fundamentally those skills. And so my life is about teaching those skills and helping people change the psychology so that they live out of what's possible, instead of out of their fear.

The real joy in life comes from giving. It comes from service. It comes from doing things for other people. That is what is so powerful about this. Nothing will make you happier than giving.

When I look out from my own business career, I tried to learn from some of the best people, regardless of the industry.