“It ain’t so much the things we don’t know that get us into trouble, it’s the things we do know that just ain’t so.” —Mark Twain

Some (very reputable) psychologists are absolutely convinced that DNA is destiny. Other (very reputable) psychologists are convinced that your personality is shaped by what happens to you as an infant – or perhaps even in the first few minutes of life. This is what I love about psychology: the theories are all over the map and yet somehow everyone is still credible.

One very interesting dimension to personality has to do with the stories that we tell ourselves. Research has increasingly revealed that our personal life stories – our mental self-narratives – contribute substantially to our personalities and behaviors. An excellent New York Times article from 2007 summarizes much of this current research.

As the interpreter of our world, the mind is very…