“The nice thing about mathematics is doing mathematics.”
Pierre Deligne in: Philip Ball. "Mathematician wins award for shaping algebra: 2013 Abel Prize goes to Belgian Pierre Deligne, who proved a deep conjecture about algebra and geometry." in Nature, 20 March 2013
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Pierre Deligne 1
mathematician 1944Related quotes

“The most important thing about mathematics is how it resides in the human brain.”
Foreword to Teichmüller Theory

“The only two good things in life are doing mathematics and teaching it.”
La vie n'est bonne qu'à deux choses : à faire des mathématiques et à les professer.
quoted by François Arago in Notices biographiques, Volume 2 http://books.google.fr/books?pg=PA662&id=ZzNLAAAAYAAJ#v=onepage&q&f=false, 1854, p. 662.

Source: Adventures of a Mathematician - Third Edition (1991), Chapter 3, Travels Abroad, p. 52

“With me, everything turns into mathematics.
More closely translated as: but in my opinion, all things in nature occur mathematically.”
Mais apud me omnia fiunt Mathematicè in Natura
""Mais"" is French for ""but"" and the ""but in my opinion"" comes from the context of the original conversation. apud me omnia fiunt Mathematicè in Natura is in latin.
Sometimes the Latin version is incorrectly quoted as Omnia apud me mathematica fiunt.
Sources: Correspondence with Mersenne http://fr.wikisource.org/wiki/Page%3aDescartes_-_%C5%92uvres,_%C3%A9d._Adam_et_Tannery,_III.djvu/48 note for line 7 (1640), page 36, Die Wiener Zeit http://books.google.com/books?id=9Xh3fVZLCycC&pg=PA532&lpg=PA532&dq=%22Omnia+apud+me+mathematica+fiunt%22+original+zitat&source=bl&ots=CgQOrveRiM&sig=WFHwIK20r5vRZ66FwCaxo857LCU&hl=de&sa=X&ei=_Wf2UcHlJYbfsgaf1IHABg#v=onepage&q=%22Omnia%20apud%20me%20mathematica%20fiunt%22%20original%20zitat&f=false page 532 (2008); StackExchange Math Q/A Where did Descartes write... http://math.stackexchange.com/questions/454599/where-did-descartes-write-with-me-everything-turns-into-mathematics?noredirect=1#comment978229_454599

In Heinz R. Pagels, The Dreams of Reason: The Computer and the Rise of the Sciences of Complexity, Ch. 3, p. 94; as quoted in Gaither's Dictionary of Scientific Quotations (Springer, 2008), p. 861

“Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.”
Letter to high school student Barbara Lee Wilson (7 January 1943), Einstein Archives 42-606
1940s
Mathematics is a way of preparing for decisions through thinking. Sets and classes provide one way to subdivide a problem for decision preparation; a set derives its meaning from decision making, and not vice versa.
C. West Churchman, Leonard Auerbach, Simcha Sadan, Thinking for Decisions: Deductive Quantitative Methods (1975) Preface.
1960s - 1970s

“Mathematics doesn’t care about those beyond the numbers.”
"I and I," p. 30
The Shape (2000), Sequence: “Happiness of Atoms”

“But in my opinion, all things in nature occur mathematically.”