If mind-brain identity theory is correct, it has great potential to unify our theories of human nature and the universe.

Still, it is not obvious that mental states are identical to brain states. It is difficult to believe that they are one and the same thing.

Reductionism in identity theory causes hard feelings in some philosophers because they feel pressured to abandon their wiggle room, the almost imperceptible space between mind and world where philosophical imagination roams free.

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