“Apes have a wide variety of sexual arrangements. That means, by the way, that there is no such thing as an ape legacy that humans are doomed to live by.”

“Even evolutionary explanations of the traditional division of labor by sex do not imply that it is unchangeable, natural in the sense of good, or something that should be forced on individual women...”

“As technology accumulates and people in more parts of the planet become interdependent, the hatred between them tends to decrease, for the simple reason that you can't kill someone and trade with h...”

“Instead of asking, Why is there war? we might ask, Why is there peace? We can obsess not just over what we have been doing wrong but also over what we have been doing right. Because we have been do...”

“The main reason that violence correlates with low socioeconomic status today is that the elites and the middle class pursue justice with the legal system while the lower classes resort to what scho...”

“Friendship, like other kinds of altruism, is vulnerable to cheaters, and we have a special name for them: fair-weather friends. These sham friends reap the benefits of associating with a valuable p...”

“All the most powerful emotions come from chaos -fear,anger,love- especially love. Love is chaos itself. Think about it! Love makes no sense. It shakes you up and spins you around. And then, eventua...”

“If for a moment you are inclined to regard these taluses as mere draggled, chaotic dumps, climb to the top of one of them, and run down without any haggling, puttering hesitation, boldly jumping fr...”

“She imagines him imagining her. This is her salvation.In spirit she walks the city, traces its labyrinths, its dingy mazes: each assignation, each rendezvous, each door and stair and bed. What he s...”

“Ignorance is hardly unusual, Miss Davar. The longer I live, the more I come to realize that it is the natural state of the human mind. There are many who will strive to defend its sanctity and then...”

“An idea occurs in the mind, where it is confined and useless. An idea lives when it leaves the mind.”

“Inside the human mind, an idea is a mental spark that occurs as a response to the challenge of a train of thought.”