Something horrible happens, and our minds play tricks on us, tell us that it never happened, that it occurred differently, or isn't quite what it seems. Such trickery, the psychiatrist George Vaillant tells us, is actually healthy. What's more, it can reveal the mind at its most creative and mature, soothing and protecting us in the face of unbearable reality, managing the unmanageable, ordering disorder. In The Wisdom of the Ego, Vaillant gives us...