“When dealing with people, remember you are not dealing with creatures of logic, but with creatures bristling with prejudice and motivated by pride and vanity.”
Variant: When dealing with people, let us remember we are not dealing with creatures of logic. We are dealing with creatures of emotion, creatures bristling with prejudices and motivated by pride and vanity.
Source: How to Win Friends and Influence People
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Dale Carnegie 98
American writer and lecturer 1888–1955Related quotes

Said to Malcolm Muggeridge, as quoted in Richard Ingrams (1996), Muggeridge: The Biography, p. 233

Interview with The Sunday Times, quoted in "Brian May Converts Estate Into Wildlife Refuge", in Contactmusic.com (9 July 2012) http://www.contactmusic.com/queen/news/brian-may-converts-estate-into-wildlife-refuge_1359933.

Random Thoughts https://townhall.com/columnists/thomassowell/2004/12/06/random-thoughts-n996213, Townhall, December 2004.
2000s

Source: On her major themes in “Interview with Buchi Emecheta” http://www.emeagwali.com/nigeria/biography/buchi-emecheta-voice-09jul96.html (Philip Emeagwali)

“An obsessive creature, constantly dominated by one kind of motive, would not survive.”
Beast and Man: The Roots of Human Nature (1979). 168.
Context: Creatures really have divergent and conflicting desires. Their distinct motives are not (usually) wishes for survival or for means-to-survival, but for various particular things to be done and obtained while surviving. And these can always conflict. Motivation is fundamentally plural. It must be so because, in evolution, all sorts of contingincies and needs arise, calling for all sorts of different responses. An obsessive creature, constantly dominated by one kind of motive, would not survive.

“Motives do not concern me; they are a dangerous subject with which to deal.”
Whelan v. Palmer (1888), L. J. Rep. (N. S.) 57 C. D. 788.