“The only way to abolish war is to make peace heroic.”
James Hinton, Philosophy and Religion: Selections from the Manuscripts of the Late James Hinton, ed. Caroline Haddon, (2nd ed., London: 1884), [//books.google.com/books?id=DpxRAAAAMAAJ&pg=PA267 p. 267].
Widely misattributed on the internet to Dewey, who actually attributes it to Hinton in Human Nature and Conduct: An Introduction to Social Psychology (New York: 1922), [//books.google.com/books?id=Ws0RAAAAYAAJ&pg=PA115 p. 115].
Misattributed
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John Dewey 62
American philosopher, psychologist, and educational reformer 1859–1952Related quotes

“The only way to have peace is to prepare for war.”
To the Duke of Newcastle (c. August 1758), quoted in Basil Williams, The Life of William Pitt, Earl of Chatham. Volume I (London: Longmans, 1913), p. 379
1750s

“Peace is only better than war if peace is not hell too. War being hell makes sense.”
The Second Coming (1980)

“The only sane policy for the world is that of abolishing war.”
Nobel Lecture for The Nobel Peace Prize 1962 (11 December 1963).
1940s-1960s

“Either Man will abolish war, or war will abolish Man.”
Fact and Fiction (1961), Part IV, Ch. 10: "Can War Be Abolished?", p. 276
1960s

In response to journalist for his views on the future of mankind at his 70th birthday (16 April 1959)

“It is easier to make war than make peace.”
Il est plus facile de faire la guerre que la paix.
"Discours de Paix" [Speech on Peace] Verdun (20 July 1919)
Prime Minister

“The cruelty of war makes for peace.”
As quoted in Our Day of Empire (1954) by Louis Obed Renne, p. 180.
Attributed

1920s, Freedom and its Obligations (1924)