“A man's power and intelligence are limited. He who wants to do everything will never do anything.”
Un Art de Vivre (The Art of Living) (1939), The Art of Working
Context: A man's power and intelligence are limited. He who wants to do everything will never do anything. Only too well do we know those people of uncertain ability who say: "I could be a great musician."..."Business would be easy for me."..."I could surely make success in politics." We may be certain that they will always be amateur musicians, failures in business, and beaten politicians. Napoleon held that the art of war consisted of making oneself strongest at a certain point; in life we must choose a point of attack and concentrate our forces there. The choice of a career must not be left to chance.
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André Maurois 202
French writer 1885–1967Related quotes

Book XI, ch. 4 (trans. Pevear and Volokhonsky)
The Brothers Karamazov (1879–1880)

Source: Interview with Uriah Shelton https://www.scifiandscary.com/interview-with-uriah-shelton/ (28 May 2017)

“He who waits to do a great deal of good at once will never do anything.”

“I can DO ANYTHING I want, but I can't DO EVERYTHING I want.”
Source: The Happiness Project: Or Why I Spent a Year Trying to Sing in the Morning, Clean My Closets, Fight Right, Read Aristotle, and Generally Have More Fun

“When a man has put a limit on what he will do, he has put a limit on what he can do.”

Source: Matilda said, "Never do anything by halves if you want to get away with it. Be outrageous. Go the whole hog. Make sure everything you do is so completely crazy it's unbelievable...

“There is no limit to what a man can do or where he can go if he doesn't mind who gets the credit.”
Reagan reportedly displayed a plaque with this proverbial aphorism on his Oval Office desk (Michael Reagan, The New Reagan Revolution (2010), p. 177). Harry S. Truman is reported to have repeated versions of the aphorism on several occasions. This exact wording was in wide circulation in the 1960s, and the earliest known variant has been attributed to Benjamin Jowett (1817–1893).
Misattributed
“He who is bent on doing evil can never want occasion.”
Maxim 459
Sentences, The Moral Sayings of Publius Syrus, a Roman Slave