“A pin is worth fighting for if a principle is involved. The first war with Great Britain was for principle and it gave us our independence and national existence. The war of 1812 was for principle and gave us our maritime independence. The war with Mexico was for principle and gave us the subjugated possessions on our whole Pacific coast. The war for the Union was for principle and resulted in the restoration of the authority of the constitution and gave us a people, north and south, animated by a military spirit which will be equal to every possible requirement.”

"War and the Arme Blanche", by Erskine Childers, Edward Arnold, (London, 1910), p. 231.
Literary Years and War (1900-1918)

1930s, Address at San Diego Exposition (1935)
Context: Our national determination to keep free of foreign wars and foreign entanglements cannot prevent us from feeling deep concern when ideals and principles that we have cherished are challenged. In the United States we regard it as axiomatic that every person shall enjoy the free exercise of his religion according to the dictates of his conscience. Our flag for a century and a half has been the symbol of the principles of liberty of conscience, of religious freedom and of equality before the law; and these concepts are deeply ingrained in our national character.

Der Kampf, den wir heute ausfechten bis zum Sieg oder bis zum bitteren Ende, ist im tiefsten Sinne ein Kampf zwischen Christus und Marx.
Christus: das Prinzip der Liebe.
Marx: das Prinzip des Hasses.
Michael: a German fate in diary notes (1926)

How the Jews Created the Comic Book Industry Part I: The Golden Age (1933-1955) Reform Judaism http://reformjudaismmag.net/03fall/comics.shtml (2003)

"The War Universe", taped conversation, first published in Grand Street, No. 37 (1991) http://openlibrary.org/b/OL7452886M/Grand_Street_37_(Grand_Street)
Context: This is a war universe. War all the time. That is its nature. There may be other universes based on all sorts of other principles, but ours seems to be based on war and games. All games are basically hostile. Winners and losers. We see them all around us: the winners and the losers. The losers can oftentimes become winners, and the winners can very easily become losers.

Speech http://hansard.millbanksystems.com/commons/1848/aug/09/supply-navy-estimates in the House of Commons (9 August 1848).
1840s
Context: The hon. Gentleman has said, in a most extraordinary manner, that our security for peace at the present day is the desire of nations to keep at home. There is a great difference between nationality and race. Nationality is the principle of political independence. Race is the principle of physical analogy, and you have at this moment the principle of race— not at all of nationality— adopted by Germany, the very country to which the hon. Member for the West Riding referred.

The answer roared from Reginald Bartlett's throat, as from those of the other tens of thousands of people jamming the Capitol Square. Someone flung a straw hat in the air. In an instant, hundreds of them, Bartlett's included, were flying. A great chorus of "Dixie" rang out, loud enough, Bartlett thought, for the damnyankees to hear it in Washington.
Source: The Great War: American Front (1998), p. 33

Speech to Conservative Party Conference (12 October 1990) http://www.margaretthatcher.org/document/108217
Third term as Prime Minister
Context: Now again in the sands of the Middle East, principle is at stake. Mr President, dictators can be deterred, they can be crushed—but they can never be appeased. These things are not abstractions. What changed the world and what will save the world were principle and resolve. Our principles: freedom, independence, responsibility, choice—these and the democracy built upon them are Britain's special legacy to the world. And everywhere those who love liberty look to Britain. When they speak of parliaments they look to Westminster. When they speak of justice they look to our common law. And when they seek to regenerate their economies, they look to the transformation we British have accomplished. Principles and resolve: They are what changed Britain a decade ago. They are what the Conservative Party brings to Britain. And they alone can secure her freedom and prosperity in the years ahead.

http://www.paulglover.org/9103.html (Ithaca Times, letter to editor), March 1991
Context: “War fans spit on the principles of the American Revolution when they charge obediently wherever their president points our flag.  Many flag-wavers know little about the U. S. Constitution, but can explain soap operas and football in detail.”