November 21, 2011.
Tom Peters Daily, Weekly Quote
Quotes about principle
page 13
The Owner Built Home: A How-to-do-it Book (1972)
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 39.

Source: Rules of Sociological Method, 1895, p. 75

Time and Individuality (1940)
Defying the Tomb: Selected Prison Writings and Art of Kevin Rashid Johnson (2010)

I read a lot of the tariff speeches and got a new sidelight on the uses to which economic theory is adapted, and the ease with which it is brushed aside on occasion. Also I wanted to find out what really had happened to wool growers as a result of protection. The obvious thing to do was to collect and analyze the statistical data... That was my first 'investigation'.
Wesley Clair Mitchell in letter to John Maurice Clark, August 9, 1928. Originally printed in Methods in Social Science, ed. Stuart Rice; Cited in: Arthur F. Burns (1965, 65-66)

Additional Letters From The Federal Farmer, 169 (1788)

Source: Problems In Genetics (1913), p. 12.

"The Landscaping of Hell : Strip-Mine Morality" (1965).
The Long-Legged House (1969)

Words to Intellectuals (1961)

2000s, The Sacred Warrior (2000)

"Just a girl with a gun; not a gratuitous killer" http://praag.org/?p=11950, Praag.org, November 25, 2013.
2010s, 2013

Source: Sexual Personae: Art and Decadence from Nefertiti to Emily Dickinson (1990), p. 96

“A proceeding may be perfectly legal and may yet be opposed to sound commercial principles.”
Verner v. General, &c. Trust (1894), L. R. 2 C. D. [1894], 264.

2000s, Bush's Lincolnian Challenge (2002)

Speech at Thanksgiving Point, Lehi, Utah, September 24, 2002. http://renewamerica.us/archives/speeches/02_09_24utah.htm.
2002

The Cornerstone Speech (1861)

“The cloven-foot of self-interest was now and then to be seen aneath the robe of public principle.”
The Provost (Edinburgh: Blackwood, 1822) p. 20.

Source: Man on His Own: Essays in the Philosophy of Religion (1959), p. 43
Source: The Principles of Organization, 1947, p. 14-15; as cited in: Albert Lepawsky (1949), Administration, p. 251-252 ; Parts published earlier in: News and Views. General Motors Acceptance Corporation, General Exchange Insurance Corporation, Motors Insurance Corporation, 1938. p. 8

Speech given to the Unitarian Radio Hour, reprinted in [McKanan, Dan, A Documentary History of Unitarian Universalism, Volume Two: From 1900 to the Present, https://books.google.com/books?id=4FBUDwAAQBAJ, 3 July 2018, 2017, Skinner House Books, 978-1-55896-791-5, 105-7]

Speech in the Senate on the National Bank Charter (February 11, 1811).

Speech to the annual assembly of the Congregational Union, London (12 May 1931), published in This Torch of Freedom (1935), pp. 83-84.
1931

1920s, Address at the Black Hills (1927)

Source: One is A Crowd: Reflections of An Individualist (1952), pp. 36-37

Source: Dictionary of Burning Words of Brilliant Writers (1895), p. 396.

He here quotes statements made about William Shakespeare by Samuel Johnson, and then one made in reference to Timon by Alexander Pope in Moral Essays.
Oration at Plymouth (1802)
Memorial inscription, reported in Edward Foss, The Judges of England, With Sketches of Their Lives (1864), Volume 8, p. 266-268.
About
"The Tallest Tale", p. 312
Leonardo's Mountain of Clams and the Diet of Worms (1998)

Source: Fragments from Reimarus: Consisting of Brief Critical Remarks on the Object of Jesus and His Disciples as Seen in the New Testament, p. 75

Saturday Review, 17, 1864, pp. 129–30
1860s

Source: A Short History Of The English Law (First Edition) (1912), Chapter I, Old English Law, p. 7

So wie wir ein Paar Hosen verwachsen, so verwachsen wir Umgang, Bibliotheken, Grundsätze und dergleichen, zuweilen, ehe sie abgenutzt sind und zuweilen, welches der schlimmste Fall ist, ehe wir neue haben.
Gedanken, Satiren, Fragmente (Thoughts, Satires, Fragments), Volume 1 http://books.google.com/books?id=azM4AQAAIAAJ&q=%22So+wie+wir+ein+Paar%22+%22Hosen+verwachsen+so+verwachsen+wir+Umgang+Bibliotheken+Grunds%C3%A4tze+und+dergleichen+zuweilen+ehe+sie+abgenutzt+sind+und+zuweilen+welches+der+schlimmste+Fall+ist+ehe+wir+neue+haben%22&pg=PA14#v=onepage (1907)

W. Donham, transcript of talk to the Association of Coll. School of Business Committee Reports and Other Literature, 5-7 May 1925. Harvard Business School, box 17, folder 10. 62
Source: Image and Logic, 1997, p. 57, footnote 66

“Surely there is not a Muslim in the world who does not aspire to freedom in principle.”
Interview Mustafa Ceric: "The West Does Not Want to Share Its Values", 2007-11-27, 2004-05-06 http://www.qantara.de/webcom/show_article.php/_c-478/_nr-105/i.html,

"Rove Rides Again — With the Help of the Democrats" in The Huffington Post (29 June 2005) http://www.huffingtonpost.com/george-lakoff/rove-rides-again-with-_b_3414.html

The Second Coming of Christ: The Resurrection of the Christ Within You, (2004) by Yogananda

Source: Waverley (1814), Chapter LXXII, A postscript, which should have been a preface
Source: The Physics Of Baseball (Second Edition - Revised), Chapter 1, Models And Their Limitations, p. 1

In Quest of Democracy (1991)
Source: Managerial Economics, 1951, p. 28; Cited in: Peter F. Drucker, Management: Tasks, Responsibilities, Practices, New York: Harper & Row, 1973.
Preface p. iv-v
A Treatise on Isoperimetrical Problems, and the Calculus of Variations (1810)

Source: Words of a Sage : Selected thoughts of African Spir (1937), p. 44 - (Gandhi said the same thing in All men are brothers; Simone Weil too, at the beginning of L'enracinement (the translator).
Harold Powers, "Language Models and Musical Analysis", p.39.

Interview with Thomas W. Hazlett in May of 1977, as published in " The Road to Serfdom, Forseeing the Fall", in Reason magazine (July 1992) http://reason.com/archives/1992/07/01/the-road-from-serfdom
1960s–1970s

1964 Memorial Edition, p. 264 http://www.jfklibrary.org/Research/Research-Aids/Ready-Reference/JFK-Quotations/Profiles-in-Courage-quotations.aspx
Pre-1960, Profiles in Courage (1956)

?
Books, The Beggar, Volume III: False Ego: The Greatest Enemy of the Spiritual Leader (Hari-Nama Press, 2002)

“Inexorable as to principles, tolerant and impartial as to persons.”
Watchword for the Roman Republic (1849)

"An interview with Paul Joseph Watson", The Tab (7 November 2016)
Source: The Next Development in Man (1948), p. 188

As quoted in His Brother's Blood: Speeches and Writings, 1838–64 https://books.google.com/books?id=qMEv8DNXVbIC&pg=PA158 (2004), edited by William Frederick Moore and Jane Ann Moore, p. 158
1850s, Speech at the Joliet Convention in Illinois (June 1858)

Source: Introduction to semantics, 1962, p. 80-81

Speech on the Labourers' Allotments Bill (11 August, 1887).
'House Of Commons, Thursday, Aug. 11', The Times (12 August, 1887), p. 6.
Harcourt said "we are all Socialists now" but The Times reported his speech in past tense.

1800s, Letter to George Churchman and Jacob Lindley (1801)

Quoted in The Ethics of Diet: A Catena of Authorities Deprecatory of the Practice of Flesh-eating https://archive.org/stream/ethicsofdietcate00will/ethicsofdietcate00will#page/n3/mode/2up by Howard Williams (London: F. Pitman, 1883), p. 283.

The Future of Democracy: A Defence Of The Rules Of The Game (1984), Ch. 7: The Rule of Men or the Rule of Law

In Quest of Democracy (1991)

Source: The Courage to Create (1975), Ch. 7 : Passion for Form, p. 134

The Decade Of Publicy http://www.stoweboyd.com/message/2010/1/2/the-decade-of-publicy.html, January 2, 2010.

Answer to Lyman Abbott (unfinished), responding to Abbott, Lyman. "Flaws in Ingersollism." The North American Review 150, no. 401 (1890): 446-457.

Making liberal men and women : public criticism of present-day education, the new paganism, the university, politics and religion https://archive.org/stream/makingliberalmen00butluoft/makingliberalmen00butluoft_djvu.txt (1921)

Speech to the National Liberal Club (3 December 1909), quoted in Better Times: Speeches by the Right Hon. D. Lloyd George, M.P., Chancellor of the Exchequer (London: Hodder & Stoughton, 1910), p. 189.
Chancellor of the Exchequer

“Bion insisted on the principle that "The property of friends is common."”
As quoted by Diogenes Laërtius, iv. 53.

Preface (August, 1864)
The Mechanical Theory of Heat (1867)
Source: The Sword or the Cross, Which Should be the Weapon of the Christian Militant? (1921), Ch.3 p. 58-59

U.S. House of Representatives http://www.house.gov/paul/congrec/congrec2002/cr090402.htm (September 4, 2002).
2000s, 2001-2005

The Cornerstone Speech (1861)

Source: Dictionary of Burning Words of Brilliant Writers (1895), p. 247.

The Differential and Integral Calculus (1836)

1894, dedication of Ryerson Physical Laboratory, quoted in Annual Register 1896, p. 159 https://books.google.com/books?id=HysXAAAAYAAJ&pg=PA159.
Variants of this quote have been misattributed to Lord Kelvin since the 1980s, though there is no evidence that he said anything of the sort. The identity of the unnamed "eminent physicist" is unknown.
Pierre Curie's Principle of One Way-Process (1970)
“Stirner … holds to a joy-principle rather than to a pleasure-principle.”
Source: Break-Out from the Crystal Palace (1974), p. 143
Source: A Mathematical Dictionary: Or; A Compendious Explication of All Mathematical Terms, 1702, p. 1, The Introduction

Speech at the Executive Club of Chicago, December 19, 1941

Source: The Natural History of the Soul (1745), Ch. V Concerning the Moving Force of Matter

Internet Encyclopedia of Philosophy