Our moral sense really evolved to bind groups together into teams that can cooperate in order to compete with other teams.
Jonathan HaidtThere are a couple of watersheds in human evolution. Most people are comfortable thinking about tool use and language use as watersheds. But the ability to play non-zero-sum games was another watershed.
Jonathan HaidtHuman rationality depends critically on sophisticated emotionality. It is only because our emotional brain works so well that our reasoning can work at all.
Jonathan Haidt