...everyday common sense is different from disciplined, rigorous, and systematic methods for posing and answering questions. Sometimes what you're sure you know is not what's really going on. Common sense says you see people as they really are, and that you classify them according to true and real categories, like race, religion, and nation, or like occupation, personality type, and age group. But the real causes and effects that work on the mind are likely different from what folk wisdom says... it isn't just what you are that causes you to think, feel, and do things; it's where you are -- what you see happening around you and how you must relate to it.
- David Berreby, Us and Them: Understanding Your Tribal Mind (New York: Little, Brown and Company, 2005), 5.