I don't measure success in numbers, but I consider my contributions of more than $1.3 billion to various causes over the years to be one of my proudest accomplishments and the best investment I've ever made. Those dollars have improved lives, saved species, fought disease, educated children, inspired change, challenged ideas and opened minds; at the time of my death, virtually all of my wealth will have gone to charity.

I'm just a socialist at heart.

If you panic that's a good way to lose. You have to stay in control.

Even if we didn't have greenhouse gases, were going to have to move away from fossil fuels, as we're going to run out. They're finite, whereas solar and wind are infinite.

When I got my statement in January, I was worth $2.2 billion. Then I got another statement in August that said I was worth $3.2 billion. So I figure it's only nine months' earnings, who cares?

Rupert Murdoch is the most dangerous man in the world.

Exposure to defeat is a very important thing. Anyone who doesn't look to get beaten is doing a disservice to himself.