“Gentlemen do not behave in such a way.”

Source: So Long, and Thanks for All the Fish

credited to Lowell Stone, M.D., born 2144; chapter 15, p. 185
The Cat Who Walks Through Walls (1985)

Source: Adverbs

Source: An Introduction to Cybernetics (1956), Part I: Mechanism, p. 1; As cited in: Stuart A. Umpleby, "Ross Ashby's general theory of adaptive systems." International Journal of General Systems 38.2 (2009): 231-238.
Context: Cybernetics treats not things but ways of behaving. It does not ask “what is this thing?” but “what does it do?”... It is thus essentially functional and behaviouristic. Cybernetics deals with all forms of behavior in so far as they are regular, or determinate, or reproducible. The materiality is irrelevant... The truths of cybernetics are not conditional on their being derived from some other branch of science. Cybernetics has its own foundations.

Source: Fly Away Home

I am the man from Oregon, with dispatches to the President of these United States, that you all read about in this morning's paper. Come on board, ladies and gentlemen, if you want to hear the news from Oregon. I've just come across the plains, two months from the Columbia River, where the Injuns are killing your missionaries. Those passengers who come aboard the Declaration shall hear all about it before they get to Pittsburg. Don't stop thar, looking at my old wolf-skin cap, but just come aboard, and hear what I've got to tell!
as quoted in Frances Fuller Victor's Eleven years in the Rocky Mountains and a life on the frontier

Part III, Chapter 11, Tradeoffs and Concessions, p. 155.
The Art and Science of Negotiation (1982)