“In short, the savage is free to imagine anything; the civilized man is constrained by evidence. The known unknown “usher[s] in the era of investigation and discovery;” the unknown known is the savage’s false belief that he can explain everything.”

-- Errol Morris, from his must-read, four-part New York Times series on “The Certainty of Donald Rumsfeld,” which is a forerunner to his must-see documentary on Rumsfeld, “The Unknown Known,” which opens in select cities (and on iTunes and OnDemand) April 4th. (Compare the above with “Reality-based community.”)

Donald Rumsfeld, certain. Colin Powell, certain of something else.