Source: Ludwig von Bertalanffy (1901-1972) (1989), p. 2
“Thomas Kuhn (1962) in his book The Structure of Scientific Revolutions divides all scientists into those who create new paradigms of science and those who work within the established paradigms. The same division may be applied to scholars and philosophers, namely into those who create new paradigms and into those who work within the established ones.”
Source: Ludwig von Bertalanffy (1901-1972) (1989), p. 2, footnote 4.
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Thaddus E. Weckowicz 22
Canadian psychologist 1919–2000Related quotes

from the group manifesto of Die Brücke, written by Kirchner in Dresden, 1906; as quoted in 'The Artists' Association 'Brücke' – Chronology' http://www.bruecke-museum.de/chronology.htm, Brücke Museum. Retrieved 29 September 2016; from Wikipedia: Kirchner
1905 - 1915

As quoted by George H. W. Bush in remarks while presenting National Medals of Science and Technology http://bushlibrary.tamu.edu/research/papers/1990/90111300.html (13 November 1990). This might be a paraphrase of statements from his introduction to "Science The Endless Frontier" (1945), rather than a direct quote. (see below)

Cassandra (1860)
Context: The progressive world is necessarily divided into two classes — those who take the best of what there is and enjoy it — those who wish for something better and try to create it. Without these two classes the world would be badly off. They are the very conditions of progress, both the one and the other. Were there none who were discontented with what they have, the world would never reach anything better.

Speech to St James's Church, Piccadilly (2 March 1983), quoted in The Times (3 March 1983), p. 14
1980s