“The progress of mathematics has been most erratic, and… intuition has played a predominant rôle in it. …It was the function of intuition to create new forms; it was the acknowledged right of logic to accept or reject these new forms, in whose birth in had no part.”
...the children had to live, so while waiting for logic to sanctify their existence, they throve and multiplied.
Number: The Language of Science (1930)
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Tobias Dantzig 25
American mathematician 1884–1956Related quotes

Source: Glamour: A World Problem (1950), Certain Preliminary Clarifications

“Intuition is a distinct form of experience.”
Internet Encyclopedia of Philosophy
Context: Intuition is a distinct form of experience. Intuition is of a self-certifying character (svatassiddha). It is sufficient and complete. It is self-established (svatasiddha), self-evidencing (svāsaṃvedya), and self-luminous (svayam-prakāsa). Intuition entails pure comprehension, entire significance, complete validity. It is both truth-filled and truth-bearing Intuition is its own cause and its own explanation. It is sovereign. Intuition is a positive feeling of calm and confidence, joy and strength. Intuition is profoundly satisfying. It is peace, power and joy.

Quote in 'From Cubism and Futurism to Suprematism: The New Realism in Painting', Kazimir Malevich, November 1916
1910 - 1920

Source: Attributed in posthumous publications, Einstein and the Poet (1983), p. 16

Preface
A Course of Lectures on Natural Philosophy and the Mechanical Arts (1807)

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.

Source: 1960s, The Gutenberg Galaxy (1962), p. 241

Letter to Dr. H. L. Gordon (May 3, 1949 - AEA 58-217) as quoted in Einstein: His Life and Universe (2007) by Walter Isaacson ISBN 9780743264730
1940s

Source: 1840s, The Mathematical Analysis of Logic, 1847, p. iii
Context: That to the existing forms of Analysis a quantitative interpretation is assigned, is the result of the circumstances by which those forms were determined, and is not to be construed into a universal condition of Analysis. It is upon the foundation of this general principle, that I purpose to establish the Calculus of Logic, and that I claim for it a place among the acknowledged forms of Mathematical Analysis, regardless that in its object and in its instruments it must at present stand alone.