“Kester wrote about people and since human nature doesn't change his observations hadn't dated.”

Comments on the government's proposed Reconciliation, Tolerance, and Unity Bill, 2 August 2005

Source: Dead Until Dark

The Soul of Man Under Socialism (1891)
Context: The only thing that one really knows about human nature is that it changes. Change is the one quality we can predicate of it. The systems that fail are those that rely on the permanency of human nature, and not on its growth and development. The error of Louis XIV was that he thought human nature would always be the same. The result of his error was the French Revolution. It was an admirable result. All the results of the mistakes of governments are quite admirable.

Patrick Standish and Jenny Bunn in Ch. 27
Take a Girl Like You (1960)

The Warriors (p. 142)
Short fiction, Tales of Known Space (1975)

Independence Day speech (1828)
Context: From the era which dates the national existence of the American people, dates also a mighty step in the march of human knowledge. And it is consistent with that principle in our conformation which leads us to rejoice in the good which befalls our species, and to sorrow for the evil, that our hearts should expand on this day; — on this day, which calls to memory the conquest achieved by knowledge over ignorance, willing co-operation over blind obedience, opinion over prejudice, new ways over old ways, when, fifty-two years ago, America declared her national independence, and associated it with her republican federation.

Source: Existentialism and Human Emotions

Source: Social Amnesia: A Critique of Conformist Psychology from Adler to Laing (1975), pp. 60-61