“Never bring a gun to a fight where the other guy has a time-machine and tomorrow's newspapers.”

Attributed to Kenneth Boulding in: Russell Ackoff " Russell Ackoff: A Lifetime of Systems Thinking; Editor’s note http://www.pegasuscom.com/levpoints/ackoff_a-lifetime-of-systems-thinking.html" in: Leverage Points, Issue 115.
1990s and attributed

Account of 8 October 1918.
Diary of Alvin York

Review of Power: A New Social Analysis by Bertrand Russell in The Adelphi (January 1939); Paraphrased variant: Sometimes the first duty of intelligent men is the restatement of the obvious.
Context: If there are certain pages of Mr Bertrand Russell's book, Power, which seem rather empty, that is merely to say that we have now sunk to a depth at which the restatement of the obvious is the first duty of intelligent men. It is not merely that at present the rule of naked force obtains almost everywhere. Probably that has always been the case. Where this age differs from those immediately preceding it is that a liberal intelligentsia is lacking. Bully-worship, under various disguises, has become a universal religion, and such truisms as that a machine-gun is still a machine-gun even when a "good" man is squeezing the trigger — and that in effect is what Mr Russell is saying — have turned into heresies which it is actually becoming dangerous to utter.

Source: Playing with Fire

Excerpt from address given to the National Rifle Association in Dallas, Texas — https://www.pbs.org/newshour/politics/watch-the-quickest-way-to-stop-a-bad-guy-with-a-gun-is-a-good-guy-with-a-gun-pence-says-at-nra-convention (May 4, 2018)
Vice President of the United States (2017-Present)

As quoted in Pretty as a Picture : The Art of David Lynch (1997)

Source: By the Time You Read This, I'll Be Dead

Source: The Light of Other Days (2000), Chapter 5

St. VI
Ode on the Death of the Duke of Wellington (1852)