Jean-Baptiste Say (1767–1832) French economist and businessman
Source: A Treatise On Political Economy (Fourth Edition) (1832), Introduction, p. xv
Bk. 1, ch. 4. Translated by Robert B. Burke, in: Edward Grant (1974) Source Book in Medieval Science. Harvard University Press. p. 93
Opus Majus, c. 1267
Jean-Baptiste Say (1767–1832) French economist and businessman
Source: A Treatise On Political Economy (Fourth Edition) (1832), Introduction, p. xv
Joseph Louis Lagrange (1736–1813) Italian mathematician and mathematical physicist
Dans Les Leçons Élémentaires sur les Mathématiques (1795) Leçon cinquiéme, Tr. McCormack, cited in Moritz, Memorabilia mathematica or, The philomath's quotation-book (1914) Ch. 15 Arithmetic, p. 261. https://archive.org/stream/memorabiliamathe00moriiala#page/260/mode/2up
Leonardo Da Vinci (1452–1519) Italian Renaissance polymath
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
Friedrich Schiller (1759–1805) German poet, philosopher, historian, and playwright
Prefatory Remarks
The Philosophical Letters
Richard Feynman book The Pleasure of Finding Things Out
It is not odd at all. You only think you know, as a matter of fact. And most of your actions are based on incomplete knowledge and you really don't know what it is all about, or what the purpose of the world is, or know a great deal of other things. It is possible to live and not know.
from lecture "What is and What Should be the Role of Scientific Culture in Modern Society", given at the Galileo Symposium in Italy (1964)
The Pleasure of Finding Things Out (1999)
W. H. Auden book The Dyer's Hand
"The Virgin & The Dynamo", p. 62
The Dyer's Hand, and Other Essays (1962)
Thomas Robert Malthus Principles of Political Economy
Book I, Introduction, p. 1
Principles of Political Economy (Second Edition 1836)
“The word truth can not be used outside of science without a misuse of terms.”
Marcellin Berthelot (1827–1907) French chemist and politician
Proverbia http://www.proverbia.net/citasautor.asp?autor=93