“Enemies are hostile, out to stop you, to eliminate you and your ideas; they are also to be loved, even as yourself.”
Source: 1960s - 1970s, The Systems Approach and Its Enemies (1979), p. 156
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C. West Churchman 64
American philosopher and systems scientist 1913–2004Related quotes

Variant translations
If you know others and know yourself, you will not be imperiled in a hundred battles; if you do not know others but know yourself, you win one and lose one; if you do not know others and do not know yourself, you will be imperiled in every single battle.
Know your enemy and know yourself, find naught in fear for 100 battles. Know yourself but not your enemy, find level of loss and victory. Know not thy enemy nor yourself, wallow in defeat every time.
Literal translation: Know [the] other, know [the] self, hundred battles without danger; not knowing [the] other but know [the] self, one win one loss; not knowing [the] other, not knowing [the] self, every battle must [be] lost.
Source: The Art of War, Chapter III · Strategic Attack

Source: age 12 http://www.vanityfair.com/magazine/2015/07/donald-ivana-trump-divorce-prenup-marie-brenner

Source: The Courage to Create (1975), Ch. 1 : The Courage to Create, p. 12

Nelson Mandela on humour, From an interview with Tim Couzens, Verne Harris and Mac Maharay for Mandela: The Authorized Portrait, 2006 (13 August 2005). Source: From Nelson Mandela By Himself: The Authorised Book of Quotations © 2010 by Nelson R. Mandela and The Nelson Mandela Foundation http://www.nelsonmandela.org/content/mini-site/selected-quotes
2000s