Source: The Quincunx of Time (1973), Chapter 8, “The Courtship of Posi and Nega” (p. 84; ellipsis in the original)
“If by motivation we mean whatever it is that causes someone to follow a particular course of action, then every action is motivated — by definition. But in most human behavior the relation between motives and action is not simple; it is mediated by a whole chain of events and surrounding conditions. We observe a man scratching his arm. His motive (or goal)? To relieve an itch.”
Source: 1940s-1950s, Administrative Behavior, 1947, p. 265.
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Herbert A. Simon 58
American political scientist, economist, sociologist, and p… 1916–2001Related quotes

“Action isn’t just the effect of motivation; it’s also the cause of it.”
Source: The Subtle Art of Not Giving a F*ck (2016), Chapter 7, “Failure Is the Way Forward” (p. 160)

environmental influence
Source: "Ordinary personology." 1998, p. 96; as cited in Malle (2011, 75)

“We want deeper sincerity of motive, a greater courage in speech and earnestness in action.”
Best Inspirational quotes by Sarojini Naidu, Happy Wishes https://happywishes20.com/quotes/best-inspirational-quotes-by-sarojini-naidu/,

http://books.google.com/books?id=vQEzAAAAMAAJ&q=%22We+should+often+be+ashamed+of+our+very+best+actions+if+the+world+only+saw+the+motives+which+caused+them%22&pg=PA47#v=onepage
Nous aurions souvent honte de nos plus belles actions, si le monde voyoit tous les motifs qui les produisent.
http://books.google.com/books?id=X8akMrBxYegC&q=%22Nous%22+%22aurions+souvent+honte+de+nos+plus+belles+Actions+si+le+monde+voyoit+tous+les+motifs+qui%22+%22les+produisent%22&pg=PA232#v=onepage
Maxim 409.
Reflections; or Sentences and Moral Maxims (1665–1678)

“People always try to find base motives behind every good action.”
The Paris Review interview (1984)
Context: People always try to find base motives behind every good action. We are afraid of pure goodness and of pure evil.

“Realization is experienced by making the Lord the motive of all actions.”
§ 2.45
Yoga Sutras of Patañjali

Lectures and Essays https://archive.org/details/lecturesandessa00havegoog (1895), p. 245