The view of human society and personality that informs this argument refuses the consistently disappointing and misleading attempt to distinguish a permanent core and a variable periphery of human nature. It takes into account the loose, contradictory, and complex set of motivations and aspirations that people demonstrate in the societies it wants to reform. It recognizes that even the most intimate and seemingly unyielding of these propensities are influenced and cumulatively remade by the institutional and imaginative context in which they exist. But it rejects as unrealistic any institutional scheme whose success requires a sudden and drastic shift in what people are like here and now.