“Strikes and boycotting are akin to war, and can be justified only on grounds analogous to those which justify war, viz., intolerable injustice and oppression.”
Diary (6 April 1886)
Diary and Letters of Rutherford Birchard Hayes (1922 - 1926)
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Rutherford B. Hayes 70
American politician, 19th President of the United States (i… 1822–1893Related quotes

Letter in Harijan (1938) http://web.archive.org/20021008131454/die_meistersinger.tripod.com/gandhi9.html
1930s
“Conflict defines nations. Enemies justify armies. Wars glorify generals.”
Ch 7
The Rahotep series, Book 3: Egypt: The Book of Chaos (2011)
Context: Conflict defines nations. Enemies justify armies. Wars glorify generals. Without his great enemy to give him purpose and meaning, he will be significantly diminished. He will have to come to terms with us.
Source: Against a Scientific Justification of Animal Experiments, p. 340


“Never think that war, no matter how necessary, nor how justified, is not a crime.”
Introduction to Treasury of the Free World (1946)
Source: Ernest Hemingway: A Literary Reference
Context: An aggressive war is the great crime against everything good in the world. A defensive war, which must necessarily turn to aggressive at the earliest moment, is the necessary great counter-crime. But never think that war, no matter how necessary, nor how justified, is not a crime. Ask the infantry and ask the dead.

Hindu View of Life (1960)

New York Times magazine op-ed piece, May 2, 2004

“No man is justified in doing evil on the ground of expediency.”

Letter to Jane Pierce (3 March 1863).

"A Community of the Free" address at the The Foreign Policy Association NY, NY (23 June 1976); this is often paraphrased: We cannot be both the world’s leading champion of peace and the world’s leading supplier of the weapons of war.
Pre-Presidency