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It needs but one foe to breed a war, and those who have not swords can still die upon them.

J.R.R. Tolkien (2012). “The Return of the King: Being the Third Part of the Lord of the Rings”, p.937, Houghton Mifflin Harcourt
It needs but one foe to breed a war, and those who have not swords can still die upon them.