“Even in physics, there is no infallible procedure for generating reliable knowledge. The calm order and perfection of well-established theories, accredited by innumerable items of evidence from a thousand different hands, eyes and brains, is not characteristic of the front-line of research, where controversy, conjecture, contradiction and confusion are rife. The physics of undergraduate text-books is 90% true; the contents of the primary research journals of physics is 90% false. The scientific system is as much involved in distilling the former out of the latter as it is in creating and transferring more and more bits of data and items of 'information'.”

Source: Sociology and modern systems theory (1967), p. vii as cited in: cited in: Ludwig von Bertalanffy (1968) General System Theory. p. 7-8.

"Body Pleasure and the Origins of Violence" (1975)

An Inquiry into Meaning and Truth (1940), Introduction, p. 15
1940s
Context: Science seems to be at war with itself.... Naive realism leads to physics, and physics, if true, shows naive realism to be false. Therefore naive realism, if true, is false; therefore it is false.

Source: Adventures of a White-Collar Man. 1941, p. 140

In his proposal to the Sir Dorab Tata Trust for establishing a "vigorous school of research in fundamental physics [in India]", which would later be the Tata Institute of Fundamental Research; as quoted in the "Homi Jehangir Bhabha" profile at the Vigyan Prasar Science Portal.
Context: There is at the moment in India no big school of research in the fundamental problems of physics, both theoretical and experimental. There are, however, scattered all over India competent workers who are not doing as good work as they would do if brought together in one place under proper direction. It is absolutely in the interest of India to have a vigorous school of research in fundamental physics, for such a school forms the spearhead of research not only in less advanced branches of physics but also in problems of immediate practical application in industry. If much of the applied research done in India today is disappointing or of very inferior quality it is entirely due to the absence of sufficient number of outstanding pure research workers who would set the standard of good research and act on the directing boards in an advisory capacity … Moreover, when nuclear energy has been successfully applied for power production in say a couple of decades from now, India will not have to look abroad for its experts but will find them ready at hand. I do not think that anyone acquainted with scientific development in other countries would deny the need in India for such a school as I propose.
The subjects on which research and advanced teaching would be done would be theoretical physics, especially on fundamental problems and with special reference to cosmic rays and nuclear physics, and experimental research on cosmic rays. It is neither possible nor desirable to separate nuclear physics from cosmic rays since the two are closely connected theoretically.

Source: The Turning Point (1982), p. 93.

The Nature of the Physical World (1928)
Context: The idealistic tinge in my conception of the physical world arose out of mathematical researches on the relativity theory. In so far as I had any earlier philosophical views, they were of an entirely different complexion.
From the beginning I have been doubtful whether it was desirable for a scientist to venture so far into extra-scientific territory. The primary justification for such an expedition is that it may afford a better view of his own scientific domain.

Preface http://www-groups.dcs.st-and.ac.uk/~history/Extras/Eddington_Gifford.html

Source: Living systems, 1978, p. 9-10; As cited in: Kenneth D. Bailey (1994) Sociology and the New Systems Theory: Toward a Theoretical Synthesis. p. 262

Richard P. Feynman in a letter to N. David Mermin, related to his AJP paper Bringing home the atomic world: Quantum mysteries for anybody, American Journal of Physics, Volume 49, Issue 10, pp. 940-943 (1981), as quoted in [Michelle Feynman, Perfectly Reasonable Deviations from the Beaten Track, Basic Books, 2005, 0-7382-0636-9, 367]