Double-mindedness can be used not just to think about how others feel or what they might be thinking, but also to think about how you may be perceived by others. Imagining yourself from another person’s vantage point is what we mean by self-awareness. When I meet someone with very little empathy, it is as if they lack the very apparatus to look inwards at themselves, as if they lack a reverse periscope that would enable any vision of themselves.
Baron-Cohen, Simon (2011-05-06). The Science of Evil: On Empathy and the Origins of Cruelty (Kindle Locations 347-350). Basic Books. Kindle Edition.