You have to just do whatever you love the most, or you'll lose interest in the whole thing. On a similar note, people also assume that you want to be big big big—as big as can be. But do you, really?

Success comes from persistently improving and inventing, not from persistently doing what's not working.

It's counterintuitive, but the way to grow your business is to focus entirely on your existing customers. Just thrill them, and they'll tell everyone.

You need to know your personal philosophy of what makes you happy and what's worth doing.

Make yourself unnecessary to the running of your business.

When you build your business on serving thousands of customers, not dozens, you don't have to worry about any one customer leaving or making special demands. If most of your customers love what you do, but one doesn't, you can just say goodbye and wish him the best, with no hard feelings.

Starting with no money is an advantage. You don't need money to start helping people.

Success comes from persistently improving and inventing, not from persistently doing what's not working.

Never forget that absolutely everything you do is for your customers. Make every decision—even decisions about whether to expand the business, raise money, or promote someone—according to what's best for your customers.