Anything that gives us new knowledge gives us an opportunity to be more rational.

Mathematics is a language. We want scientists to be able to read it, speak it, and write it. But we are are not training them to be grammarians.

Human beings know a lot of things, some of which are true, and apply them. When we like the results, we call it wisdom.

Learning is any change in a system that produces a more or less permanent change in its capacity for adapting to its environment.

The proper study of mankind is the science of design.

Human knowledge has been changing from the word go and people in certain respects behave more rationally than they did when they didn't have it. They spend less time doing rain dances and more time seeding clouds.

The intelligent altruists, though less altruistic than unintelligent altruists, will be fitter than both unintelligent altruists and selfish individuals.