"The world is not interested in your self-esteem. The world will expect you to accomplish something BEFORE you feel good about yourself."

"The greatest danger in the world is not knowing what you're doing."

"I'm a big believer in the idea that if you have a lot of wealth, you have a responsibility to give back to society."

"Until we can get rid of malaria and tuberculosis, and all these diseases that are so terrible in poor countries, that's going to be my total focus."

"I really don't think there's any problem with people getting rich."