Poverty is not deprivation, it is isolation.

If you don't contradict yourself on a regular basis, then you're not thinking.

We sometimes think of being good at mathematics as an innate ability. You either have "it" or you don't. But to Schoenfeld, it's not so much ability as attitude. You master mathematics if you are willing to try.

There's no idea that can't be explained to a thoughtful 14-year-old. If the thoughtful 14-year-old doesn't get it, it is your fault, not the 14-year-old's.

There will be statues of Bill Gates across the Third World. There's a reasonable shot that - because of his money - we will cure malaria.

The key to good decision making is not knowledge... It's whether our work fulfills us.

The single most important thing a city can do is provide a community where interesting, smart people want to live with their families.