“It was the great multiplicity of the hadrons that led to the formulation of the quark model. Without some organizing principle such a large collecton of particles seemed unwieldy, and the possibility that they might all be elementary offended those who hold the conviction, or at leas the fond wish, that nature should be simple.”

[Gauge theories of the strong, weak, and electromagnetic interactions, Princeton University Press, 2013, 2, https://books.google.com/books?id=Lt6thfc1gAgC&pg=PA2]

Source: More Is Different (1972), p. 393 of [More is different, Science, 177, 4047, 4 August 1972, 393–396, https://www.tkm.kit.edu/downloads/TKM1_2011_more_is_different_PWA.pdf]

Source: A Theory of Justice (1971; 1975; 1999), Chapter III, Section 23, pg. 131

Theoria motus corporum coelestium in sectionibus conicis solem ambientum (1809) Tr. Charles Henry Davis as Theory of the Motion of the Heavenly Bodies moving about the Sun in Conic Sections http://books.google.com/books?id=cspWAAAAMAAJ& (1857)
Context: The principle that the sum of the squares of the differences between the observed and computed quantities must be a minimum may, in the following manner, be considered independently of the calculus of probabilities. When the number of unknown quantities is equal to the number of the observed quantities depending on them, the former may be so determined as exactly to satisfy the latter. But when the number of the former is less than that of the latter, an absolutely exact agreement cannot be obtained, unless the observations possess absolute accuracy. In this case care must be taken to establish the best possible agreement, or to diminish as far as practicable the differences. This idea, however, from its nature, involves something vague. For, although a system of values for the unknown quantities which makes all the differences respectively less than another system, is without doubt to be preferred to the latter, still the choice between two systems, one of which presents a better agreement in some observations, the other in others, is left in a measure to our judgment, and innumerable different principles can be proposed by which the former condition is satisfied. Denoting the differences between observation and calculation by A, A’, A’’, etc., the first condition will be satisfied not only if AA + A’ A’ + A’’ A’’ + etc., is a minimum (which is our principle) but also if A4 + A’4 + A’’4 + etc., or A6 + A’6 + A’’6 + etc., or in general, if the sum of any of the powers with an even exponent becomes a minimum. But of all these principles ours is the most simple; by the others we should be led into the most complicated calculations.

Source: Why Stock Markets Crash - Critical Events in Complex Systems (2003), Chapter 2, Fundamentals Of Financial Markets, p. 38.

Otto Neurath (1983) "The orchestration of the sciences by the encyclopedism of logical empiricism." In R. S. Cohen, M. Neurath, & C. R. Fawcett (Eds.), Otto Neurath: Philosophical papers, 1913–1946 (pp. 230–242). Boston: Riedel. (First published 1946); p. 239
1940s and later

Quote in Life History Of E.V.Ramasamy, Priyar Center http://www.periyarcentre.in/abtperiyar.html
Reform

1770s, African Slavery in America (March 1775)

TED talk on beauty and truth in physics —video timecode 14m28s (March 2007) http://ted.com/index.php/talks/murray_gell_mann_on_beauty_and_truth_in_physics.html.