“I have long believed that an experimentalist should not be unduely inhibited by theoretical untidyness.”
If he insists in having every last theoretical T crossed before he starts his research the chances are that he will never do a significant experiment. And the more significant and fundamental the experiment the more theoretical uncertainty may be tolerated. By contrast, the more important and difficult the experiment the more that experimental care is warranted. There is no point in attempting a half-hearted experiment with an inadequate apparatus.
as quoted by [W. Happer, P. J. E. Peebles, and D. T. Wilkinson, Biographical Memoirs, Robert Henry Dicke May 6, 1916 — March 4, 1997, http://www.nap.edu/readingroom/books/biomems/rdicke.html]
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Robert H. Dicke 2
American astronomer 1916–1997Related quotes

as quoted by E.E. Kintner at the Artsimovich Memorial Session of the Seventh International Conference on Plasma Physics and Controlled Nuclear Fusion Research

Answer to question seeking his views on limiting U.S. presidents to two terms, news conference, Washington, D.C. (October 5, 1956), in Public Papers of the Presidents of the United States: Dwight D. Eisenhower, 1956, p. 862.
1950s

Tout le monde y croit cependant, me disait un jour M. Lippmann, car les expérimentateurs s'imaginent que c'est un théorème de mathématiques, et les mathématiciens que c'est un fait expérimental.
Calcul des probabilités (2nd ed., 1912), p. 171
Inaugural address as President of Yale University (11 April 1964)

Session 290, Page 70
The Early Sessions: Sessions 1-42, 1997, The Early Sessions: Book 7

"Disappointment Is the Lot of Women" oration (17 or 18 October 1855) quoted in Elizabeth Cady Stanton, Susan B. Antony, and Mathilda Gage, History of Woman Suffrage, vol. 1 (1881)

“I believe in the immortality of the soul because I have within me immortal longings.”
Source: To Love This Life: Quotations By Helen Keller