Robert N. Proctor (1954) American historian
Source: Value-free science?: Purity and power in modern knowledge, 1991, p. 10
Book VI : Liber O (1909)
Context: In this book it is spoken of the Sephiroth and the Paths; of Spirits and Conjurations; of Gods, Spheres, Planes, and many other things which may or may not exist. It is immaterial whether these exist or not. By doing certain things certain results will follow; students are most earnestly warned against attributing objective reality or philosophic validity to any of them.
Robert N. Proctor (1954) American historian
Source: Value-free science?: Purity and power in modern knowledge, 1991, p. 10
Maimónides book The Guide for the Perplexed
Source: Guide for the Perplexed (c. 1190), Part I, p.106 (1881) Tr. Friedlander
Albert Einstein (1879–1955) German-born physicist and founder of the theory of relativity
Insofern sich die Sätze der Mathematik auf die Wirklichkeit beziehen, sind sie nicht sicher, und insofern sie sicher sind, beziehen sie sich nicht auf die Wirklichkeit. http://books.google.com/books?id=QF0ON71WuxEC&q=%22Insofern+sich+die+S%C3%A4tze+der+Mathematik+auf+die%22&pg=PA3#v=onepage<br><br>Geometrie and Erfahrung (1921) pp. 3-4 link.springer.com http://link.springer.com/chapter/10.1007%2F978-3-642-49903-6_1#page-1 as cited by Karl Popper, The Two Fundamental Problems of the Theory of Knowledge (2014) Tr. Andreas Pickel, Ed. Troels Eggers Hansen.<br>Ref: en.wikiquote.org - Albert Einstein / Quotes / 1920s<br><br>http://books.google.com/books?id=QF0ON71WuxEC&q=%22beziehen+sind+sie+nicht+sicher+und+insofern+sie+sicher+sind+beziehen+sie+sich+nicht+auf+die+Wirklichkeit%22&pg=PA4#v=onepage <br class="br">1920s, Sidelights on Relativity (1922)
Aristotle book Metaphysics
Book IV, 1005
Metaphysics
Original: (el) τὸ γὰρ αὐτὸ ἅμα ὑπάρχειν τε καὶ μὴ ὑπάρχειν ἀδύνατον τῷ αὐτῷ καὶ κατὰ τὸ αὐτό (καὶ ὅσα ἄλλα προσδιορισαίμεθ᾽ ἄν, ἔστω προσδιωρισμένα πρὸς τὰς λογικὰς δυσχερείας): αὕτη δὴ πασῶν ἐστὶ βεβαιοτάτη τῶν ἀρχῶν: ἔχει γὰρ τὸν εἰρημένον διορισμόν. ἀδύνατον γὰρ ὁντινοῦν ταὐτὸν ὑπολαμβάνειν εἶναι καὶ μὴ εἶναι, καθάπερ τινὲς οἴονται λέγειν Ἡράκλειτον.
Source: https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.01.0051%3Abook%3D4%3Asection%3D1005b
Yves Klein (1928–1962) French artist
Source: before 1960, Ritual for the Relinquishment of the immaterial Pictorial Sensitivity Zones', Yves Klein, 1957-59, p. 207
“Do the thing you fear the most and the death of fear is certain.”
Mark Twain (1835–1910) American author and humorist
Paul Bernays (1888–1977) Swiss mathematician
Paul Bernays, Platonism in mathematics http://sites.google.com/site/ancientaroma2/book_platonism.pdf (1935)
Maimónides book The Guide for the Perplexed
Source: Guide for the Perplexed (c. 1190), Part III, Ch.10
Peter Checkland (1930) British management scientist
Source: Systems Thinking, Systems Practice, 1981, p. 219 as cited in: Robert L. Flood, Norma R.A. Romm (1997) Critical Systems Thinking. p. 206
Paul Karl Feyerabend (1924–1994) Austrian-born philosopher of science
Pg 84.
Conquest of Abundance (2001 [posthumous])