“It is not the similarity or dissimilarity of individuals that constitutes a group, but interdependence of fate.”

— Kurt Lewin

Kurt Lewin (1939) "When facing danger". In Lewin, G. W. (Ed.), Resolving Social Conﬂict. London: Harper & Row.
1930s

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Kurt Lewin 48

German-American psychologist 1890–1947

Giannina Braschi (1953) Puerto Rican writer

“No people are uninteresting.
Their fate is like the chronicle of planets.
Nothing in them is not particular,
and planet is dissimilar from planet.”

Yevgeny Yevtushenko (1932–2017) Russian poet, film director, teacher

"People" (1961), line 1; Robin Milner-Gulland and Peter Levi (trans.) Selected Poems (London: Penguin, 2008) p. 85.

“System' is the concept that refers both to a complex of interdependencies between parts, components, and processes, that involves discernible regularities of relationships, and to a similar type of interdependency between such a complex and its surrounding environment.”

Talcott Parsons (1902–1979) American sociologist

Talcott Parsons (1968) "Systems Analysis: Social Systems" in: David L. Sills ed. International Encyclopedia of the Social Sciences. p. 458; Cited in: Ida R. Hoos (1972) Systems Analysis in Public Policy: A Critique.

Sören Kierkegaard (1813–1855) Danish philosopher and theologian, founder of Existentialism

1840s, On the Concept of Irony with Continual Reference to Socrates (1841)

“As apt and applicable as the Declaration of Independence is today, we would do well to honor that other historic document drafted in this hall — the Constitution of the United States. For it stressed not independence but interdependence — not the individual liberty of one but the indivisible liberty of all.”

John F. Kennedy (1917–1963) 35th president of the United States of America

1962, Address at Independence Hall

“The Constitution favors no racial group, no political or social group.”

William O. Douglas (1898–1980) Associate Justice of the Supreme Court of the United States

Dissenting, Uphaus v. Wyman, 364 U.S. 388, 406 (1960)
Judicial opinions

“We are accustomed to speak of ideas as reproduced, as passed from mind to mind, as similar or dissimilar to one another, and, in short, as if they were substantial things; nor can any reasonable objection be raised to such expressions.”

Charles Sanders Peirce (1839–1914) American philosopher, logician, mathematician, and scientist

The Law of Mind (1892)
Context: We are accustomed to speak of ideas as reproduced, as passed from mind to mind, as similar or dissimilar to one another, and, in short, as if they were substantial things; nor can any reasonable objection be raised to such expressions. But taking the word "idea" in the sense of an event in an individual consciousness, it is clear that an idea once past is gone forever, and any supposed recurrence of it is another idea. These two ideas are not present in the same state of consciousness, and therefore cannot possibly be compared.