" You know, Ethan, there are cultures on earth who believe that—under the right circumstances—a person can be separated from their inner spirit.” “Inner spirit?” Rush repeated. “I mean the intangible life force that links us from this world to the next. The Byzantines, the Incans, certain Native American tribes, Enlightenment-era Rosicrucians, all had variant belief structures regarding such a thing—there were, and are, many others. "

― Lincoln Child , The Third Gate (Jeremy Logan, #3)