“War is an evil thing.”
26 March 1940, Speech at St. John Ambulance Association and Indian Red Cross Society, also quoted in Speeches and Statements of the Marquess of Linlithgow, p. 241
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Victor Hope, 2nd Marquess of Linlithgow 7
British politician, agriculturalist and colonial administra… 1887–1952Related quotes

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“Language is an evil thing, a very evil thing. And a force to be reckoned with.”
As quoted in The Guardian (19 March 2005)

Justice in War-Time (1916), p. 27
1910s

Tito on the Hungarian Revolution of 1956, as quoted in Jasper Ridley, Tito: A Biography (Constable and Company Ltd., 1994), p. 342.
Other

“There is no such thing as an evil genius, as evil in it's self is stupidity.”
Source: The Wizard of Ooze

Patriotism, or Peace? http://en.wikisource.org/wiki/Patriotism,_or_Peace%3F (1896), translated by Nathan Haskell Dole
Variant:
I have already several times expressed the thought that in our day the feeling of patriotism is an unnatural, irrational, and harmful feeling, and a cause of a great part of the ills from which mankind is suffering, and that, consequently, this feeling – should not be cultivated, as is now being done, but should, on the contrary, be suppressed and eradicated by all means available to rational men. Yet, strange to say – though it is undeniable that the universal armaments and destructive wars which are ruining the peoples result from that one feeling – all my arguments showing the backwardness, anachronism, and harmfulness of patriotism have been met, and are still met, either by silence, by intentional misinterpretation, or by a strange unvarying reply to the effect that only bad patriotism (Jingoism or Chauvinism) is evil, but that real good patriotism is a very elevated moral feeling, to condemn which is not only irrational but wicked.
What this real, good patriotism consists in, we are never told; or, if anything is said about it, instead of explanation we get declamatory, inflated phrases, or, finally, some other conception is substituted for patriotism – something which has nothing in common with the patriotism we all know, and from the results of which we all suffer so severely.
Patriotism and Government http://en.wikisource.org/wiki/Patriotism_and_Government (1900)
Context: Tell people that war is an evil, and they will laugh; for who does not know it? Tell them that patriotism is an evil, and most of them will agree, but with a reservation. "Yes," they will say, "wrong patriotism is an evil; but there is another kind, the kind we hold." But just what this good patriotism is, no one explains.

Douglas Brinkley, Tulane history professor. http://www.nola.com/newsflash/louisiana/index.ssf?/base/news-22/1136568553158920.xml&storylist=louisiana
Quotes of others about Thompson