“A distinction does not have to be clear to be important, and, at some point, there is a common-sense dividing line between procedural and violent conflict. Violence is most closely associated with conquest as a form of conflict settlement, though violence is descriptive of a conflict process rather than of a conflict settlement. It is quite possible, for instance, for conquest to be nonviolent, that is, for one party to be absorbed in another or for one organization to be dissolved by strictly procedural means. Departments are organized out of existence, countries are federated or united, organizations are laid down, and firms are bankrupted by purely procedural processes, without more than perhaps a trace of legal coercion lurking in the background.”
Source: 1960s, Conflict and defense: A general theory, 1962, p. 323
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Kenneth E. Boulding 163
British-American economist 1910–1993Related quotes

“The only conflict that is possible in Soviet culture is the conflict between good and best.”
Quoted in Aly Monroe, "Black Bear"

5th Public Talk, Amsterdam, The Netherlands (30 May 1967)
1960s

[2011-12-13, Interview with Alvin Plantinga on Where the Conflict Really Lies, Paul, Pardi, Philosophy News, http://www.philosophynews.com/post/2011/12/13/Interview-with-Alvin-Plantinga-on-Where-the-Conflict-Really-Lies.aspx]
Posed question: Are you mainly trying to show that there's no logical conflict even though there might be a methodological conflict?

"Society, Morality and the Novel" (1957), in The Collected Essays, ed. John F. Callahan (New York: Modern Library, 1995), p. 699.

Further response to the above question
1950s, Freedom From the Self (1955)

Speech as Minister of Native Affairs on 5 December 1950, 10 quotes by Hendrik Verwoerd (Politics Web) https://www.sahistory.org.za/archive/hendrik-verwoerd-10-quotes-hendrik-verwoerd-politics-web-20-september-2016, sahistory.org.za (20 September 2016)
Source: 1960s, Conflict and defense: A general theory, 1962, p. 2, partly cited in: Dennis Sandole (1998) A Comprehensive Mapping Of Conflict And Conflict. Resolution: A Three Pillar Approach http://www.gmu.edu/programs/icar/pcs/sandole.htm
Anatol Rapoport, Conflict in man-made environment. Harmondsworth: Penguin Books, 1974; As cited in M.J. Apter, J.H. Kerr, S. Murgatroyd (1993) Advances in Reversal Theory. p. 63-64
1970s and later