Part of the reason, according to Kleiman, is “the brute fact that people identify their opinions with themselves; to admit having been wrong is to have lost the argument, and (as Vince Lombardi said), every time you lose, you die a little.” And, he adds, “there is no more destructive force in human affairs—not greed, not hatred—than the desire to have been right.”

A liberal education, Kleiman says, “ought, above all, to be an education in non-attachment to one’s current opinions. I would define a true intellectual as one who cares terribly about being right, and not at all about having been right.” Easy to say, very hard to achieve. For all sorts of reasons. But it’s worth thinking about. Even if it came at the cost of sacrificing or altering our most dearly-held opinions … the truth might set us free.