Walter Anderson made an interesting observation in his book Courage is a 3 Letter Word:

Hundreds of times I have looked into the eyes of a successful person and asked, "When it is dark and you are alone, do you ever say to yourself, What will I do when they find out I'm me?" I've never failed to make a friend with the question. And I've never failed to get a nod. It was as if I know who they were, and that I understood and, because I understood, I could be trusted. I've seen the cool, disciplined, practiced composure of some of America's toughest business leaders melt.

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Sermon's Illustrated