“The study of Euler's works will remain the best school for the different fields of mathematics and nothing else can replace it.”
As quoted by Louise Grinstein, Sally I. Lipsey, Encyclopedia of Mathematics Education (2001) p. 235.
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Carl Friedrich Gauss 50
German mathematician and physical scientist 1777–1855Related quotes

Sketches from Cambridge http://books.google.com/books?id=mjA4AAAAMAAJ&q=%22If+you+wish+at+once+to+do+nothing+and+to+be+respectable+now-a-days+the+best+pretext+is+to+be+at%22+%22work+on+some+profound+study%22&pg=PA5#v=onepage (1865)
Source: "Does the history of psychology have a future?." 1994, p. 472

The Evolution of the Physicist's Picture of Nature (1963)
Context: Just by studying mathematics we can hope to make a guess at the kind of mathematics that will come into the physics of the future. A good many people are working on the mathematical basis of quantum theory, trying to understand the theory better and to make it more powerful and more beautiful. If someone can hit on the right lines along which to make this development, it may lead to a future advance in which people will first discover the equations and then, after examining them, gradually learn how to apply them.
Source: The End of Education: Redefining the Value of School

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“Only by a study of the development of mathematics can its contemporary significance be understood.”
100 Years of Mathematics: a Personal Viewpoint (1981)
Context: The professional mathematician can scarcely avoid specialization and needs to transcend his private interests and take a wide synoptic view of the whole landscape of contemporary mathematics. His scientific colleagues are continually seeking enlightenment on the relevance of mathematical abstractions. The undergraduate needs a guidebook to the topography of the immense and expanding world of mathematics. There seems to be only one way to satisfy these varied interests... a concise historical account of the main currents... Only by a study of the development of mathematics can its contemporary significance be understood.