
“Economics is not an exact science.”
Source: The Age of Uncertainty (1977), Chapter 1, p. 36
Die Politik ist keine exakte Wissenschaft.
Speech to Prussian upper house (18 December 1863)
Politics is not a science, as the professors are apt to suppose. It is an art.
Expression in the Reichstag (1884), as quoted in The Quote Verifier : Who Said What, Where, and When (2006) by Ralph Keyes
1860s
Variant: Die Politik ist keine Wissenschaft, wie viele der Herren Proffessoren sich einbilden, sondern eine Kunst.
Die Politik ist keine exakte Wissenschaft.
“Economics is not an exact science.”
Source: The Age of Uncertainty (1977), Chapter 1, p. 36
“but, in reality, there is no such thing as an exact science.”
Source: The Theory of Political Economy (1871), Chapter I, Introduction, p. 40.
“An exact science is one that admits loss.”
The German Order
Source: Talks on Pedagogics, (1894), p. 64. Reported in Robert Edouard Moritz. Memorabilia mathematica; or, The philomath's quotation-book https://archive.org/stream/memorabiliamathe00moriiala#page/81/mode/2up, (1914), p. 263
As quoted in Dictionary of Scientific Biography (1970 - 1990) edited by M Steck.
Conor Clarke, An Interview With Paul Samuelson, Part One http://www.theatlantic.com/politics/archive/2009/06/an-interview-with-paul-samuelson-part-one/19572/ (2009)
New millennium
“The whole subject-matter of exact science consists of pointer readings and similar indications.”
Source: The Nature of the Physical World (1928), Ch. 10 The New Quantum Theory <!-- p. 219 -->
"Quotes", Anatomy of Criticism: Four Essays (1957), Polemical Introduction