“Screen credit is valuable only when it's given you. If you're in a position to give yourself credit, you don't need it.”
Quoted by Norman J. Zierold in The Moguls (New York: Coward-McCann, 1969). Also quoted as "Credit you give yourself is not worth having." Thalberg never took an onscreen credit in films he produced; MGM gave him a screen credit for The Good Earth (1937), released after his death.
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Irving Thalberg 1
American film producer 1899–1936Related quotes

“Want more credit for all you do and who you are? Be the one who gives credit to others.”

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Will Rogers, Ambassador of Good Will, Prince of Wit and Wisdom (1935)
Variant: People often ask me, 'Will, where do you get your jokes?' I just tell 'em, 'Well, I watch the government and report the facts, that is all I do, and I don't even find it necessary to exaggerate.
Variant: I don't make jokes. I just watch the government and report the facts.

TVGuide.com, February 19, 2000 http://web.archive.org/20011114053556/www.eonline.com/News/Items/0,1,8955,00.html