This latest work by Sowell examines two competing visions which shape our debates about the nature of reason, justice, equality, and power. These visions are the &quot;constrained&quot; vision, which sees human nature as unchanging and selfish, and the &quot;unconstrained&quot; vision, in which human nature is malleable and perfectible. The book builds a convincing case that ethical and policy disputes are ultimately based on the differences in these visions. It covers a wide variety of political, philosophical, and economic thought. Although occasionally abstract, this volume is an important contribution to our understanding of current social issues. Recommended for large public and all college and university libraries. ~ <em>Library Journal</em>