“In practical administration, experience is everything.”
Napoleon : In His Own Words (1916)
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Napoleon I of France 259
French general, First Consul and later Emperor of the French 1769–1821Related quotes

“The saying, "Practice is everything," is Periander’s.”
Periander, 6.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 1: The Seven Sages

“Learning from experience is a faculty almost never practiced”

As translated by Alan R. Clarke (1996).
By The River Piedra I Sat Down and Wept (1994)

“You cannot overestimate the unimportance of practically everything.”

661-2
Philosophy, Science and Art of Public Administration (1939)

Cassie Scerbo Interview https://www.clichemag.com/entertainment-interview/cassie-scerbo-interview (June 15, 2015)