Source: The Virtues of War: A Novel of Alexander the Great
“You know horses are smarter than people. You never heard of a horse going broke betting on people.”
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Will Rogers 121
American humorist and entertainer 1879–1935Related quotes

“Like a horse, honey, somebody's gonna break you.'
'Never. Going. To. Happen.”
Source: Iced

“When people see a strong horse and a weak horse, by nature they will like the strong horse.”
Video interview, quoted in Analyzing Leaders, Presidents and Terrorists by Diane E. Holloway page 325 https://books.google.co.uk/books?id=Jc7CY1yV1g8C&pg=PA325, with NPR transcript https://www.npr.org/news/specials/response/investigation/011213.binladen.transcript.html (9 November 2001)
2000s, 2002

Address to the Annual Dinner of the Canadian Press, Toronto, April 18, 1956
Speaking Of Canada - (1959)

Conversation: Elon Musk on Wired Science (2007)

“All music is folk music. I ain't never heard a horse sing a song.”
Variant: All music is folk music. I ain't never heard a horse sing a song.

“Always be smarter than the people who hire you.”