Who am I? Most of us believe we can answer this question pretty well. Yet, you probably know someone who is self-deluded-which raises the uncomfortable possibility that you might be too. But how would you know? In fact, the more we learn about self-knowledge, the clearer it is that we all lack insight into ourselves and how others see us. Benjamin Franklin was right when he wrote: "There are three things extremely hard: steel, a diamond, and to know one's self." Human nature hasn't changed in the intervening 250 years, but we do know more about why and when we struggle to see ourselves clearly. This, in turn, suggests there may be ways to improve self-knowledge. Here is our guide.
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