“The prescription of the equality of human beings is not a description of an alleged actual equality among humans: it is a prescription of how we should treat human beings.”

Dune Genesis (1980)
Context: In the beginning I was just as ready as anyone to fall into step, to seek out the guilty and to punish the sinners, even to become a leader. Nothing, I felt, would give me more gratification than riding the steed of yellow journalism into crusade, doing the book that would right the old wrongs.
Reevaluation raised haunting questions. I now believe that evolution, or deevolution, never ends short of death, that no society has ever achieved an absolute pinnacle, that all humans are not created equal. In fact, I believe attempts to create some abstract equalization create a morass of injustices that rebound on the equalizers. Equal justice and equal opportunity are ideals we should seek, but we should recognize that humans administer the ideals and that humans do not have equal ability.

Speech to the Conservative Party Conference (10 October 1975) http://www.margaretthatcher.org/document/102777
Leader of the Opposition
Context: Some Socialists seem to believe that people should be numbers in a State computer. We believe they should be individuals. We are all unequal. No one, thank heavens, is like anyone else, however much the Socialists may pretend otherwise. We believe that everyone has the right to be unequal but to us every human being is equally important.

"Chimpanzees - Bridging the Gap", in Paola Cavalieri, Peter Singer, The Great Ape Project: Equality Beyond Humanity (1996), p. 14

Source: Private Rights and Public Illusions (1994), p. 81

Twitter post https://twitter.com/McCormickProf/status/941035451904856064 (13 December 2017)
2017

From 1980s onwards, Critical Path (1981)

The Gay Science (1882)