My success, part of it certainly, is that I have focused in on a few things.

If you want to build a great company, get the hell out of Silicon Valley.

We have two other countries, Pakistan and Afghanistan - again it's the instability that is a problem there. So over the next several years, we expect to drive the number of [polio] cases back down to zero because that is likely to be the second disease after smallpox that we completely eradicate.

Students deserve great teachers. And teachers deserve the support they need to become great.

In the same way that when the car got going, people thought it would be an electric car, people thought it would be a steam car.

If your business is not on the Internet, then your business will be out of business.

If you're a guest [at my $113 million house], you'll be able to call up on screens throughout the house almost any image you like - presidential portraits, reproductions of High Renaissance paintings, pictures of sunsets, airplanes, skiers in the Andes, a rare French stamp, the Beatles in 1965.