“I do not like weapons, Doctor; they are the last resort of faulty diplomacy.”
Source: The Star Beast (1954), Chapter 9, “Customs and an Ugly Duckling” (p. 151)
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Robert A. Heinlein 557
American science fiction author 1907–1988Related quotes

“I do not believe in violence; it is the last resort of fools.”
Dawn (1884), CHAPTER XXI

“I shouldn't get into … this is diplomacy, and I don't do diplomacy.”
http://www.guardian.co.uk/quiz/questions/0,,1943315,00.html
http://transcripts.cnn.com/TRANSCRIPTS/0304/30/se.01.html
http://www.bbc.co.uk/radio4/news/bh/rumsfeld.shtml
2000s

“Die, my dear doctor! That's the last thing I shall do!”
Apocryphal account of Palmerston's last words - Familiar Short Sayings of Great Men, 6th ed., comp. by Samuel Arthur Bent. Boston: Ticknor and Co., 1887; [Date of Printout]. via Bartleby.com http://www.bartleby.com/344/308.html
Misattributed

'I don't really do diplomacy': Tony Abbott unsure of his next move https://www.theage.com.au/federal-election-2019/i-don-t-really-do-diplomacy-tony-abbott-unsure-of-his-next-move-20190531-p51tbe.html; Sydney Morning Herald, June 2, 2019
Post-Parliament (2019-)

“Threats are the last resort of a man with no vocabulary.”
Source: Lady Knight

Letter to Lord Lytton (8 March 1877), quoted in David Steele, Lord Salisbury: A Political Biography (2001), p. 108
1870s