Ramsay MacDonald (1866–1937) British statesman; prime minister of the United Kingdom
Speech to the National Labour conference at Caxton Hall, London (28 October 1935), quoted in The Times (29 October 1935), p. 9
1930s
Opening the Canadian National Exhibition, The Globe, 29 August 1906, page 1.
Ramsay MacDonald (1866–1937) British statesman; prime minister of the United Kingdom
Speech to the National Labour conference at Caxton Hall, London (28 October 1935), quoted in The Times (29 October 1935), p. 9
1930s
“In peace, prepare for war. In war, prepare for peace.”
Sun Tzu (-543–-495 BC) ancient Chinese military general, strategist and philosopher from the Zhou Dynasty
Sometimes erroneously prepended to the opening line "The art of war is of vital importance to the State", but appears to be a variation of the Roman motto "Si vis pacem, para bellum". It's not clear who first misattributed this phrase to Sun Tzu. The earliest appearance of the phrase in Google Books is 1920, when it appeared in a pharmaceutical journal, but no attribution was given then.
Misattributed
John F. Kennedy (1917–1963) 35th president of the United States of America
1963, American University speech
“The cause of war is preparation for war.”
W.E.B. Du Bois (1868–1963) American sociologist, historian, activist and writer
Source: The Wisdom of W.E.B. Du Bois (2003), p. 75
“Lead me into war…you know I believe in you.”
Tony Blair (1953) former Prime Minister of the United Kingdom
http://www.nytimes.com/2006/03/27/international/europe/27memo.html?_r=1 Meeting with George W. Bush on January 31, 2003. <br class="br">2000s
African Spir (1837–1890) Russian philosopher
"L'antagonisme entre les nationalités perdra toute son acuité le jour où n'existera plus la tendance inique à l'oppression et à la domination, ni le perpétuel danger des menaçants préparatifs de guerre. », Fr. "
Source: Words of a Sage : Selected thoughts of African Spir (1937), p. 54.
Harry Browne (1933–2006) American politician and writer
" The Libertarian stand on abortion http://www.harrybrowne.org/articles/Abortion.htm. <br class="br">2000s
Abu Bakr al-Baghdadi (1971–2019) leader of the Islamic State of Iraq and the Levant
As quoted in "Isis leader Abu Bakr al-Baghdadi resurfaces in audio urging supporters to join terror group", Independent (15 May 2015)
2014, 2015
Source: http://www.independent.co.uk/news/world/middle-east/isis-leader-abu-bakr-al-baghdadi-resurfaces-in-audio-urging-supporters-to-join-terror-group-10251955.html