“All war represents a failure of diplomacy.”
Speech http://hansard.millbanksystems.com/commons/1991/feb/28/the-gulf in the House of Commons (28 February 1991)
1990s
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Tony Benn 69
British Labour Party politician 1925–2014Related quotes

“All diplomacy is a continuation of war by other means.”
As quoted in Saturday Evening Post (27 March 1954); this is a play upon the famous maxim of Clausewitz: "War is the continuation of politics by other means".

“When diplomacy ends, War begins.”

Preface (page XIX)
The Great War for Civilization (2005)
“To North Korea, diplomacy is another form of war.”
"Stranger Than Fiction" https://web.archive.org/web/*/http://www.nytimes.com/2005/02/13/opinion/stranger-than-fiction.html The New York Times (13 February 2005)
2000s

Source: The Best That Money Can't Buy: Beyond Politics, Poverty, & War (2002), p. 31.

“Take the diplomacy out of war and the thing would fall flat in a week.”
As quoted in Wit (2003) by Des MacHale, p. 299
As quoted in ...

“All war is a symptom of man's failure as a thinking animal.”

“… the Peace Treaties must be scrapped … I stand for no more war and no more secret diplomacy.”
Extract from his 1922 election address, quoted in T.W. Walding (ed.), Who's Who in the New Parliament:Members and their pledges (Philip Gee, London, 1922), p. 35
1920s