Source: Social Amnesia: A Critique of Conformist Psychology from Adler to Laing (1975), p. 30
“Concepts, like individuals, have their histories, and are just as incapable of withstanding the ravages of time as are individuals.”
1840s, On the Concept of Irony with Continual Reference to Socrates (1841)
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Sören Kierkegaard 309
Danish philosopher and theologian, founder of Existentialism 1813–1855Related quotes

As quoted in http://www.columbia.edu/itc/mealac/pritchett/00ambedkar/txt_ambedkar_salvation.html

(describing Marx’s view), p. 35.
Capitalism and Modern Social Theory (1971)

Translation J. L. Austin (Oxford, 1950) as quoted by Stephen Toulmin, Human Understanding: The Collective Use and Evolution of Concepts (1972) Vol. 1, p. 56.
Grundgesetze der Arithmetik, 1893 and 1903

“The history of the race is but that of the individual "writ large."”
Vol. 2, p. 135
The Foundations of a Creed (1874-5)

http://www.zefrank.com/theshow/archives/2006/05/052406.html
"The Show" (www.zefrank.com/theshow/)

The Moon Is a Harsh Mistress (1966)
Context: A rational anarchist believes that concepts, such as "state" and "society" and "government" have no existence save as physically exemplified in the acts of self-responsible individuals. He believes that it is impossible to shift blame, share blame, distribute blame... as blame, guilt, responsibility are matters taking place inside human beings singly and nowhere else. But being rational, he knows that not all individuals hold his evaluations, so he tries to live perfectly in an imperfect world... aware that his efforts will be less than perfect yet undismayed by self-knowledge of self-failure.