Thomas Sowell Behind the episodic eruptions of specific political and social controversies is a pattern of beliefs about the world, about man, and about causation. These implicit assumptions or visions repeatedly divide controversialists at all intellectual levels, on a wide spectrum of issues, and across the boundaries of the law, the economy, the polity, and the society, as well as across international boundaries. Though these controversies often become emotional, the opposing views tend to cluster, not around an emotion, but around the logic of a vision. Each vision tends to generate conclusions which are the logical consequences of its assumptions. That is why there are such repeated conflicts of visions in such a range of otherwise unrelated issues.

(Thomas Sowell, A Conflict of Visions: Ideological Origins of Political Struggles [New York: Basic Books, 2002], 245)