Source: "Foundations of the Theory of Signs," 1938, p. 58-59 as cited in: Adam Schaff (1962). Introduction to semantics, p. 88-89
“A general semiotics studies the whole of the human signifying activity — languages — and languages are what constitutes human beings as such, that is, as semiotic animals. It studies and describes languages through languages.”
[O] : Introduction, 0.8
Semiotics and the Philosophy of Language (1984)
Context: A general semiotics studies the whole of the human signifying activity — languages — and languages are what constitutes human beings as such, that is, as semiotic animals. It studies and describes languages through languages. By studying the human signifying activity it influences its course. A general semiotics transforms, for the very fact of its theoretical claim, its own object.
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Umberto Eco 120
Italian semiotician, essayist, philosopher, literary critic… 1932–2016Related quotes

Michael Halliday (2006, p. 68) as cited in: Andrew Halliday and Marion Glaser (2011).
1970s and later
Variant: The full characterization of a language may now be given: A language in the full semiotic sense of the term is any intersubjective set of sign vehicles whose usage is determined by syntactical, semantical, and pragmatical rules.
Source: Writings on the General Theory of Signs, 1971, p. 48; as cited in: Adam Schaff (1962). Introduction to semantics, p. 314
—Walter Eugene Clark ,.Quoted from Gewali, Salil (2013). Great Minds on India. New Delhi: Penguin Random House.
Source: The Nature and Authority of Scripture (1995), p. 20
Context: The famous Rgveda text, "One is the Truth, the sages speak of it differently" (1.64.46), is often employed to explain away doctrinal differences as merely semantic ones. The point of this text, as its context makes quite clear, is not really to dismiss the significance of the different ways in which we speak of the One or to see these ways as equally valid. The text is really a comment on the limited nature of human language. Such language must by nature be diverse in its attempts to describe that which is One and finally indescribable. The text, however, is widely cited in ways that seem to make interreligious dialogue redundant.

Source: What is Anthropology? (2nd ed., 2017), Ch. 2 : Key Concepts

Source: 1970s and later, Learning How to Mean--Explorations in the Development of Language, 1975, p. 122 cited in: M.A.K. Halliday, Jonathan Webster (2006) The Language of Early Childhood. p. 289.

Footnote at pp. 126-127; As cited in: Adam Schaff (1962). Introduction to semantics, p. 313-314
The Origins and Prehistory of Language, 1956

Source: The Cambridge Encyclopedia of the English Language, 1987, p. 84