Human beings pose a problem for Descartes’ metaphysics. Descartes is, of course, a substance dualist: mind and body are “really distinct” substances that can exist apart from each other. Each has its own “principal attribute” that exhausts its nature: minds are all and only thinking things; bodies are all and only extended things. God and angels are examples of Cartesian minds existing on their own. Rocks, robots, finches, and ferns are examples of Cartesian bodies existing on their own. Human beings pose a problem because we clearly have both minds and bodies, and yet we don’t seem to be merely aggregates of the two: I seem to be something that both thinks and is extended, not something that has a part that thinks and a part that is extended. What, then, is the metaphysical status of the human being?0
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