100 Years of Mathematics: a Personal Viewpoint (1981)
“I presume that few who have paid any attention to the history of the Mathematical Analysis, will doubt that it has been developed in a certain order, or that that order has been, to a great extent, necessary -- being determined, either by steps of logical deduction, or by the successive introduction of new ideas and conceptions, when the time for their evolution had arrived.”
Source: 1850s, A treatise on differential equations (1859), p. v; cited in: Quotations by George Boole http://www-history.mcs.st-and.ac.uk/Quotations/Boole.html, MacTutor History of Mathematics, August 2010.
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George Boole 39
English mathematician, philosopher and logician 1815–1864Related quotes

Homo Neanderthalensis Baltimore Sun (June 29th, 1925), The Impossible Mencken
1920s

Source: 1910s, Introduction to Mathematical Philosophy (1919), Ch. 18: Mathematics and Logic

As quoted in The Century: A Popular Quarterly (1874) ed. Richard Watson Gilder, Vol. 7, pp. 508-509, https://books.google.com/books?id=ceYGAQAAIAAJ&pg=PA508 "Relations of Mathematics to Physics". Earlier quote without citation in Nature, Volume 8 (1873), page 450.
Also quoted partially in Michael Grossman and Robert Katz, Calculus http://babel.hathitrust.org/cgi/mb?a=listis;c=216746186|Non-Newtonian (1972) p. iv. ISBN 0912938013.
The Epic of America (2nd ed., Greenwood Press, 1931), p. 405

Quoted by C. S. Hastings in "Biographical Memoir of Josiah Willard Gibbs 1839-1903," National Academy of Sciences Biographical Memoirs, vol. VI (Washington, D.C.: National Academy of Sciences, 1909), p. 390. Complete memoir http://books.nap.edu/html/biomems/jgibbs.pdf
Attributed

Source: Essays in tektology, 1980, p. xiv

When asked what the George W. Bush administration's legacy in foreign affairs would be, interview http://www.usnews.com/news/politics/articles/2008/01/02/qa-madeleine-albright with Thomas Omestad, U.S. News & World Report (January 2, 2008)
2000s
Darkness and Day (London: Victor Gollancz, [1951] 1974) p. 216.

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The Differential and Integral Calculus (1836)