“Threats alone are the weapons of the threatened man.”
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes
Source: Drenai series, Legend, Pt 1: Against the Horde, Ch. 9
Context: Liberty is only valued when it is threatened, therefore it is the threat that highlights the value. We should be grateful to the Nadir, since they heighten the value of our liberty.

Source: The Invisible Bankers, Everything The Insurance Industry Never Wanted You To Know (1982), Chapter 13, Gerber Life: Like Taking Candy From A Baby, p. 239.

Presidential campaign (April 12, 2015 – 2016), First presidential debate (September 26, 2016)

Hansard http://www.parliament.the-stationery-office.co.uk/pa/cm200102/cmhansrd/vo020410/debtext/20410-04.htm, House of Commons 6th series, vol. 383, col. 23.
House of Commons statement on discussions with President Bush over the Middle East, 10 April 2002.
2000s

usatoday.com, February 11, 2003 http://www.usatoday.com/news/washington/2003-02-11-dems-war-uast_x.htm

Interview "Colonies in space may be only hope, says Hawking" by Roger Highfield in Daily Telegraph (16 October 2001) http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2001/10/16/nhawk16.xml&sSheet=/news/2001/10/16/ixhome.html

Source: Isaac Herzog (2021) cited in " Iran must be stopped from obtaining a nuclear bomb, with or without deal - Herzog https://www.jpost.com/arab-israeli-conflict/article-689474" on The Jerusalem Post, 22 December 2021.