Quote from : Brain, Belief, and Politics Book

Rather than there being two distinct and unambiguous categories of constrained and unconstrained (or tragic and utopian) visions of human nature, I think there is just one vision with a sliding scale. Let’s call this the Realistic Vision. If you believe that human nature is partly constrained in all respects—morally, physically, and intellectually—then you hold a Realistic Vision of human nature.