Controversies in politics arise from many sources, but the conflicts that endure for generations or centuries show a remarkably consistent pattern. In this classic work, Thomas Sowell analyzes the two competing visions that shape our debates about the nature of reason, justice, equality, and power: the "constrained" vision, which sees human nature as unchanging and selfish, and the "unconstrained" vision, in which human nature is malleable and perfectible. He describes how these two radically opposed views have manifested themselves in the political controversies of the past two centuries, including such contemporary issues as welfare reform, social justice, and crime. Updated to include sweeping political changes since its first publication in 1987, this revised edition of A Conflict of Visions offers a convincing case that ethical and policy disputes circle around the disparity between both outlooks.