Know your numbers' is a fundamental precept of business.

If you rely too much on the people in other countries and other companies, in a sense that's your brain and you are outsourcing your brain.

Driving up the value of the advertising is a big commitment for Microsoft.

A top-quartile teacher will increase the performance of their class - based on test scores - by over 10 percent in a single year. ... That means that if the entire U.S., for two years, had top-quartile teachers, the entire difference between us and Asia would go away.

If you mess up, it's not your parents' fault, so don't whine about your mistakes, learn from them.

Stolen's a strong word. It's copyrighted content that the owner wasn't paid for.

If we [Microsoft Corporation] weren't still hiring great people and pushing ahead at full speed, it would be easy to fall behind and become a mediocre company. Fear should guide you, but it should be latent. I have some latent fear. I consider failure on a regular basis.