John Dewey's Human Nature and Conduct... What struck me... was the related idea that human thought is a reaction to frustrated habit— what people often do when the outcome of their action disappoints their expectation. I concluded that unthinking, habitual action is the natural and truly happy way of life; whereas thought is a symptom of dysfunction but conducive to survival all the same since, every so often, new thoughts find ways of escaping the frustration that provoked them by inventing satisfying new ways to get things done.

The Pursuit of Truth: A Historian's Memoir (2005)