" Wooden-headedness, the source of self-deception, is a factor that plays a remarkably large role in government. It consists in assessing a situation in terms of preconceived fixed notions while ignoring or rejecting any contrary signs. It is acting according to wish while not allowing oneself to be deflected by the facts. It is epitomized in a historian’s statement about Philip II of Spain, the surpassing wooden-head of all sovereigns: “No experience of the failure of his policy could shake his belief in its essential excellence. "

― Barbara W. Tuchman , The March of Folly: From Troy to Vietnam