“Each metaphysician has his own system, which to a large extent excludes that of his predecessors and colleagues. Hence... metaphysics are built either on air or on quicksands—either they start from no foundation in facts at all, or the superstructure has been raised before a basis has been found in the accurate classification facts.”
Introductory
The Grammar of Science (1900)
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Karl Pearson 65
English mathematician and biometrician 1857–1936Related quotes

Introductory p.1
A Budget of Paradoxes (1872)

Source: The Reappearance of the Christ (1948), Chapter III: The Reappearance of the Christ, World Expectancy

“In fact, nothing is said that has not been said before.”
Nullumst iam dictum quod non dictum sit prius.
Nullum est iam dictum quod non dictum sit prius.
Prologue, Line 41.
Variant translation: Nothing has yet been said that’s not been said before.
Eunuchus

Book Review, 35 Harv. L. Rev. 479, 479 (1922) (reviewing Benjamin N. Cardozo's The Nature of the Judicial Process).
Extra-judicial writings

Source: 1850s, An Investigation of the Laws of Thought (1854), p. 50

“Every man has a right to his own opinion, but no man has a right to be wrong in his facts.”
Deming Headlight (New Mexico), 6 January 1950, as cited in the Yale Book of Modern Proverbs and at There Are Opinions, And Then There Are Facts; Freakonomics blog post by Fred R. Shapiro http://www.freakonomics.com/2011/08/18/there-are-opinions-and-then-there-are-facts/ (18 August 2011)