Quotes about proportion
page 3

this harmonic proportion may be expressed as <math>\frac{12}{6}=\frac{12-8}{8-6}</math> or inversely.
Nicomachus of Gerasa: Introduction to Arithmetic (1926)

As quoted in The Sufi Path of Love : The Spiritual Teachings of Rumi (1983) by William C. Chittick, p. 162
The Making of America (1986)

pg. 388
The Sports and Pastimes of the People of England (1801), Cruelty to insects

Essay on the Principle of Population (1798; rev. through 1826)

Source: Small Houses: Their Economic Design and Construction (1922), Ch. II

"Zionism versus Bolshevism", Illustrated Sunday Herald (February 1920)
Early career years (1898–1929)

“Laws, like sausages, cease to inspire respect in proportion as we know how they are made.”
As quoted in University Chronicle. University of Michigan (27 March 1869) books.google.de http://books.google.de/books?id=cEHiAAAAMAAJ&pg=PA164, Daily Cleveland Herald (29 March 1869), McKean Miner (22 April 1869), and "Quote... Misquote" http://www.nytimes.com/2008/07/21/magazine/27wwwl-guestsafire-t.html by Fred R. Shapiro in The New York Times (21 July 2008); similar remarks have long been attributed to Otto von Bismarck, but this is the earliest known quote regarding laws and sausages, and according to Shapiro's research, such remarks only began to be attributed to Bismarck in the 1930s.
"Loop Quantum Gravity," The New Humanists: Science at the Edge (2003)

The Construction of the Wonderful Canon of Logarithms (1889)

Introductory
A Treatise on Man and the Development of His Faculties (1842)

Preface of M. Quetelet
A Treatise on Man and the Development of His Faculties (1842)
Source: Everyone is African: How Science Explodes the Myth of Race (2015), p. 155.

Speech to Conservative Party Conference (8 October 1976) http://www.margaretthatcher.org/document/103105
Leader of the Opposition

Dr. Whewell on Moral Philosophy (1852), in Dissertations and Discussions: Political, Philosophical, and Historical, vol. 2, London: John W. Parker and son, 1859, p. 485 https://books.google.it/books?id=w-I3AQAAMAAJ&pg=PA485

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter IV, Sec. 6

Source: How to Pay for the War (1940), Ch. 2 : The Character of the Solution

Source: 1870s - 1880s, The Writings of a Savage (1996), p. 24: quote in his letter to Vincent van Gogh, c. 1888

The Philosophy of Atheism (1916)

Letter to Abbe Salimankis (1810) ME 12:379 The Writings of Thomas Jefferson "Memorial Edition" (20 Vols., 1903-04) edited by Andrew A. Lipscomb and Albert Ellery Bergh, Vol. 12, p. 379; also quoted at "Thomas Jefferson on Politics & Government: Money & Banking" at University of Virginia http://etext.virginia.edu/jefferson/quotations/jeff1325.htm
Posthumous publications, On financial matters
Source: Lectures on Teaching, (1906), pp. 267-268.
Source: Growing Up Absurd (1956), p. 157.
Source: The Administrative State, 1948, p. 202

1992, quoted in [1978-1996: Texas Representative Ron Paul’s Newsletters Contain a Host of Bigoted Claims and Observations, History Commons, http://www.historycommons.org/context.jsp?item=a7896paulnewsletter#a7896paulnewsletter]
Disputed, Newsletters, Ron Paul Political Report

As editor of Die Transvaler on 1 October 1937, 10 quotes by Hendrik Verwoerd (Politics Web) https://www.sahistory.org.za/archive/hendrik-verwoerd-10-quotes-hendrik-verwoerd-politics-web-20-september-2016, sahistory.org.za (20 September 2016)

“Preserving the sweetness of proportion and expressing itself beyond expression.”
The Masque of Hymen (1606)
Donald Judd (1987) Complete writings, 1975-1986. p. 35 : Cited in: Marjanovic, Marianne Berger. "To build new ways of talking about the work": Hovedbegreper i Donald Judds kunstteori." (2005).
1980

The Milwaukee Sentinel Princess Puts Motherhood First Jul 17, 1971

“Every man has a mob self and an individual self, in varying proportions.”
Pornography and Obscenity (1929)

Source: A Discourse of Combinations, Alterations, and Aliquot Parts (1685), Ch.I Of the variety of Elections, or Choice, in taking or leaving One or more, out of a certain Number of things proposed.

1930s, Message to Congress on tax revision (1935)

Michael W. Dols, The Black Death in the Middle East, Princeton University Press, 1977, p. 67.

Source: Practical Pictorial Photography, 1898, The use of the lens in pictorial work, p. 51

S.R. Goel, Some Historical Questions (Indian Express, April 16, 1989), quoted in Shourie, A., & Goel, S. R. (1990). Hindu temples: What happened to them.

"Escape from Freedom" http://journalism.nyu.edu/faculty/files/willis-tomfrank.pdf, Situations: Project of the Radical Imagination, Vol 1, No 2 (2006)

when the velocity <math>v</math> approaches the speed of light c, the denominator approaches 0 thus E approaches infinity, unless m = 0.
Source: The Lightness of Being – Mass, Ether and the Unification of Forces (2008), Ch. 3, p. 19 & Appendix A

Accord de différentes loix de la nature qui avoient jusqu’ici paru incompatibles (1744)

“It is a scale of proportions which makes the bad difficult and the good easy.”
Er ist eine Skala der Proportionen, die das Schlechte schwierig und das Gute leicht macht.
On the Modulor. Letter sent to Le Corbusier (1946); quoted in Modulor (1953)
1940s

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book II, Chapter V, Sec. 2

1840s, Past and Present (1843)
Geometry as a Branch of Physics (1949)

Quoted by C. P. Scott in his diary (3 April 1917), in Trevor Wilson (ed.), The Political Diaries of C. P. Scott, 1911-1928 (London: Collins, 1970), p. 274
Prime Minister

“A sense of humour is a sense of proportion.”
Sand and Foam (1926)

"11th Foundational Falsehood of Creationism" https://www.youtube.com/watch?v=Dm277H3ot6Y, Youtube (June 26, 2008)
Youtube, Foundational Falsehoods of Creationism

“The importance of information is directly proportional to its improbability.”
Lucifer's Hammer (1985)

Speech at Bristol on declining the poll (9 September 1780)
1780s

Letter to James Lloyd (1 October 1822)

As quoted by A. D'Abro, The Evolution of Scientific Thought from Newton to Einstein https://archive.org/details/TheEvolutionOfScientificThought (1927)

Source: The Dawn of Indian Music in the West http://books.google.co.in/books?id=OSZKCXtx-wEC&pg=PA46, A&C Black, 24 April 2006, p. 46

Ragnar Frisch. " A complete scheme for computing all direct and cross demand elasticities in a model with many sectors http://econ.ucdenver.edu/beckman/Research/readings/frisch-demand-econometrica.pdf." Econometrica 27.2 (1959): 177-196.
1940-60s

To the Public, plate 3 (the last paragraph)
1800s, Jerusalem The Emanation of The Giant Albion (c. 1803–1820)

Speech http://www.heraldscotland.com/sport/spl/aberdeen/major-s-contradiction-on-constitutional-reform-questioned-by-snp-leader-salmond-calls-for-same-say-for-scotland-1.669219 in Northern Ireland (27 July 1995).

Preface (March 30, 1807)
A Course of Lectures on Natural Philosophy and the Mechanical Arts (1807)
March 30, 1989 letter sent to every member of the United States Congress ([An Open Letter, William B. Ruger, 18, American Handgunner, 5, 12, 1992]).

Les Loix du Mouvement et du Repos, déduites d'un Principe Métaphysique (1746)

“It is only in the case of musical instruments that I find any commendable diligence in the [Irish] people. They seem to me to be incomparably more skilled in these than any other people that I have seen. The movement is not, as in the British instrument to which we are accustomed, slow and easy, but rather quick and lively, while at the same time the melody is sweet and pleasant. It is remarkable how, in spite of the great speed of the fingers, the musical proportion is maintained. The melody is kept perfect and full with unimpaired art through everything – through quivering measures and the involved use of several instruments – with a rapidity that charms, a rhythmic pattern that is varied and a concord achieved through elements discordant.”
In musicis solum instrumentis commendabilem invenio gentis istius diligentiam. In quibus, prae omni natione quam vidimus, incomparabiliter instructa est. Non enim in his, sicut in Britannicis quibus assueti sumus instrumentis, tarda et morosa est modulatio, verum velox et praeceps, suavis tamen et jocunda sonoritas. Mirum quod, in tanta tam praecipiti digitorum rapacitate, musica servatur proportio; et arte per omnia indemni inter crispatos modulos, organaque multipliciter intricata, tam suavi velocitate, tam dispari paritate, tam discordi concordia, consona redditur et completur melodia.
Topographia Hibernica (The Topography of Ireland) Part 3, chapter 11 (94); translation from Gerald of Wales (trans. John J. O'Meara) The History and Topography of Ireland ([1951] 1982) p. 103.

4 July 1942.
Disputed, (1941-1944) (published 1953)
Source: The Functions of the Executive (1938), p. 282

Essay II, Chapter X, note.
De l'esprit or, Essays on the Mind, and Its Several Faculties (1758)

Source: The Income Tax: Root of All Evil (1954), p. 52

Quarterly Review, 151, 1881, pp. 542-544
1880s

No Compromise – No Political Trading (1899)

The Novel: What It Is (1893)

ME 13:426
1810s, Letters to John Wayles Eppes (1813)

Speech http://hansard.millbanksystems.com/commons/1884/apr/03/second-reading-adjourned-debate-fifth in the House of Commons (3 April 1884).

Source: The Image: A Guide to Pseudo-Events in America (1961), p. 12.

Source: 1960s, Jours effeuillés: Poèmes, essaies, souvenirs (1966), p. 307

The Quaker City; or, the Monks of Monk Hall, part 1, chapter 9 "The Bride" (1844)

“There has been a comparatively greater proportion of good queens, than of good kings.”
Letter 9 (August 25, 1837).
Letters on the Equality of the Sexes and the Condition of Woman (1837)

VI. The language of Form and Colour
1910 - 1915, Concerning the Spiritual in Art, 1911

“Greatness of individuality is inversely proportional to the mass of the social aggregate.”
The Source and Aim of Human Progress (1919)
Hal Draper, " The Two Souls of Socialism https://www.marxists.org/archive/draper/1966/twosouls/index.htm," New Politics 5, no. 1 (Winter 1966), 57-84.

Article on the 25th anniversary of his 'Rivers of Blood speech', The Times (20 April 1993), p. 18
1990s

Chakravarti Rajagopalachari (1960) The voice of the uninvolved: speeches and statements on atomic warfare and test explosions. p. 167

1880s, Reminiscences (1881)

No. 447 (2 August 1712).
The Spectator (1711–1714)

Source: The Principles of Political Economy and Taxation (1821) (Third Edition), Chapter XXX, Influence of Demand and Supply, p. 260

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 261.
“Christian Aesthetics,” The Trinity Review, May 1989.

De Pace Fidei (The Peace of Faith) (1453)