Rather than there being two distinct and unambiguous categories ofconstrained and unconstrained (or tragic and utopian) visions of humannature, I think there is just one vision with a sliding scale. Let’s call this theRealistic Vision. If you believe that human nature is partly constrained inall respects—morally, physically, and intellectually—then you hold aRealistic Vision of human nature.
Michael Shermer, Brain, Belief, and Politics
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