Source: Mohd Shukri Abdull (2019) cited in " Whoever is involved in RM90m claim will be called - MACC https://www.malaysiakini.com/news/463574" on Malaysia Kini, 11 February 2019.
“Speculation must wait upon the facts.”
August 1909, Popular Science Monthly Volume 75, Article:"The Varificational Factor in Handwriting", p. 153
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June Downey 8
American psychologist 1875–1932Related quotes

Source: Democracy Realizedː The Progressive Alternative (1998), p. 15

“The evil influence of the supposed inconsistency of theory and practice upon speculative science”
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Context: The evil influence of the supposed inconsistency of theory and practice upon speculative science, although much less conspicuous than it was in the ancient and middle ages, is still occasionally to be traced. This it is which opposes the mutual communication of ideas between men of science and men of practice, and which leads scientific men sometimes to employ, on problems that can only be regarded as ingenious mathematical exercises, much time and mental exertion that would be better bestowed on questions having some connection with the arts, and sometimes to state the results of really important investigations on practical subjects in a form too abstruse for ordinary use; so that the benefit which might be derived from their application is for years lost to the public; and valuable practical principles which might have been anticipated by reasoning, are left to be discovered by slow and costly experience.<!--pp. 175

Lee v. Jones (1864), 17 C. B. (N. S.) 506.

Founding Address (1876), Life and Destiny (1913)
Context: It is not possible to enter into the nature of the Good by standing aloof from it — by merely speculating upon it. Act the Good, and you will believe in it. Throw yourself into the stream of the world's good tendency and you will feel the force of the current and the direction in which it is setting. The conviction that the world is moving toward great ends of progress will come surely to him who is himself engaged in the work of progress.
By ceaseless efforts to live the good life we maintain our moral sanity. Not from without, but from within, flow the divine waters that renew the soul.

“The Thing in the Stone” (pp. 211-212); originally published in Worlds of If, March 1970
Short Fiction, Skirmish (1977)

“I think that only daring speculation can lead us further and not accumulation of facts.”
Letter to Michele Besso (8 October 1952). According to Scientifically speaking: a dictionary of quotations, Volume 1 (2002), p. 154 http://books.google.com/books?id=FFIBzawsfPEC&lpg=PR1&pg=PA154#v=onepage&q&f=false, the letter is reprinted on p. 487 of Correspondance 1903-1955 (1972) by Michele Besso.
1950s

Sheldon v. Goodrich, 8 Ves. 481, 497 (1803)
1990