“On quantum theory I use up more brain grease (rough translation of German idiom) than on relativity.”

—  Albert Einstein

Quoted by Otto Stern, a colleague of Einstein in Zurich from 1912 to 1914, in a 1962 oral history interview http://www.aip.org/history/ohilist/4904.html with Thomas S. Kuhn
Attributed in posthumous publications

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Albert Einstein 702
German-born physicist and founder of the theory of relativi… 1879–1955

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Variant: If my theory of relativity is proven successful, Germany will claim me as a German and France will declare that I am a citizen of the world. Should my theory prove untrue, France will say that I am a German and Germany will declare that I am a Jew. (Address to the French Philosophical Society at the Sorbonne (6 April 1922); French press clipping (7 April 1922) [Einstein Archive 36-378] and Berliner Tageblatt (8 April 1922) [Einstein Archive 79-535])
Variant translation: If my theory of relativity is proven correct, Germany will claim me as a German and France will say I am a man of the world. If it's proven wrong, France will say I am a German and Germany will say I am a Jew.
Variant: If relativity is proved right the Germans will call me a German, the Swiss will call me a Swiss citizen, and the French will call me a great scientist. If relativity is proved wrong the French will call me a Swiss, the Swiss will call me a German and the Germans will call me a Jew.
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