“The very first essential for success is a perpetually constant and regular employment of violence.”
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Adolf Hitler 265
Führer and Reich Chancellor of Germany, Leader of the Nazi … 1889–1945Related quotes
“Justice is the constant and perpetual will to render to every man his due.”
Iustitia est constans et perpetua voluntas ius suum cuique tribuendi.

“Employment is Nature's physician, and is essential to human happiness.”
Latter day attributions
Source: Day's Collacon: an Encyclopaedia of Prose Quotations, (1884), p. 223.

Source: An Essay on Old Age, 1732, p. 136

Memorandum, 'The Dollar Situation: Forthcoming Discussions with U.S.A. and Canada' (4 July 1949), quoted in Correlli Barnett, The Lost Victory: British Dreams, British Realities: 1945–1950 (London: Pan, 1996), p. 353
Chancellor of the Exchequer

Source: Eddy, J.A., "The Maunder Minimum", Science 18 June 1976: Vol. 192. no. 4245, pp. 1189 - 1202 http://www.sciencemag.org/cgi/content/citation/192/4245/1189, PDF Copy http://bill.srnr.arizona.edu/classes/182h/Climate/Solar/Maunder%20Minimum.pdf

Attributed in Adam L. Penenberg, "Why Google Is Like Wal-Mart" https://archive.is/20130630165550/www.wired.com/culture/lifestyle/news/2005/04/67287?currentPage=all, Wired, 21 April 2005
The Paris Review interview (1958)
Context: The perfect ideal would be that a man who is essentially nonviolent would be able to defend himself against any form of violence. But this is very rare in life. But this raises one of the most important themes in Eternity, why Prewitt does not shoot back at the MPs who kill him as he tries to get back to his unit after his murder of Fatso Judson. You see, when Prewitt kills Fatso he is carrying the theory of vengeance by violence to its final logical end. But the thing is that Fatso doesn't even know why he is being killed; and when Prewitt sees that, he realizes what a fruitless thing he has done.

"War and the Arme Blanche", by Erskine Childers, Edward Arnold, (London, 1910), p. 231.
Literary Years and War (1900-1918)
The Four Cardinal Virtues: Prudence, Justice, Fortitude, Temperance (1965)