The extreme self-sacrifice characteristic of group-selected species such as ants and bees can often be found among soldiers.

The initial organization of the brain does not depend that much on experience. Nature provides a first draft, which experience then revises.

America is very much about individual happiness, the right to expression, self-determination. In America you do need to point to harm befalls victims before you can limit someone else's rights.

We can tolerate great diversity in our aesthetic beliefs, but we can't tolerate much diversity in our moral beliefs.

The most powerful force ever known on this planet is human cooperation - a force for construction and destruction.

By temperament and disposition and emotions, I'm a liberal; but in my beliefs about what's best for the country, I'm a centrist.

The psychological origins of love are in attachment to parents and sexual partners. We do not attach to ourselves; we do not seek security and fulfillment in ourselves.