One of the principles of international behavior is that our diplomats -- we send them around the world -- that they are going to be protected, they are not targets for threats or physical violence.

WHITEHOUSE: President Obama and President Lee Press Availability

So I ask you to maintain the principles that have changed behavior and made this program a success.

NPR: Text of Bush's State of the Union Address

The authors cannot be said to be ignorant of the existence of economic principles that govern human behavior, but a case can be made that they misunderstand them.

FORBES: Simple Economics Lessons for Two Historians

Our behavior is driven by details, not abstract principles.

FORBES: Beyond Greed, We All Have Blind Spots