I SAT, STRANDED, in a muggy Asian airport. It had been a long, over-scheduled trip seeking new private banking clients. In the midst of a pile of debris left behind by the late-night floor sweepers, I noticed a dog-eared book. I picked it up and, from that moment, my view of the world was changed forever.

“If a man does not keep pace with others, perhaps it is because he hears a different drummer,” it began with the frequently quoted Henry David Thoreau. The book, a since-discontinued presentation of the theories of Swiss psychologist Carl Jung, outlined new insights into the way people take in information and make decisions. The contents confirmed what I had long sensed intuitively, having observed people with fascination since ...

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