From wikiquote

"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf."

Alternative: "We sleep safely at night because rough men stand ready to visit violence on those who would harm us."

In his 1945 "Notes on Nationalism", Orwell claimed that the statement, "Those who ‘abjure’ violence can only do so because others are committing violence on their behalf" was a "grossly obvious" fact.

Notes: allegedly said by George Orwell although there is no evidence that Orwell ever wrote or uttered either of these versions of this idea. They do bear some similarity to comments made in an essay that Orwell wrote on Rudyard Kipling, when quoting from one of his poems. Orwell did write, in his essay on Kipling, that the latter's "grasp of function, of who protects whom, is very sound. He sees clearly that men can only be highly civilized while other men, inevitably less civilized, are there to guard and feed them." (1942)