
p. 485 http://books.google.com/books?id=ePNi4ZqYdVQC&q=%22humans+are+interchangeable%22
The Blank Slate (2002)
Source: The Blank Slate: The Modern Denial of Human Nature
Context: [E]quality is not the empirical claim that all groups of humans are interchangeable; it is the moral principle that individuals should not be judged or constrained by the average properties of their group. … If we recognize this principle, no one has to spin myths about the indistinguishability of the sexes to justify equality.