Source: Definition of System, 1956, p. 18: Introduction
“Astronomers… have a common ground for discussion with musicians in the harmony of the stars and musical concords in tetrads and triads of the fourth and the fifth, and with geometricians in the subject of vision; and in all other sciences many points, perhaps all, are common so far as the discussion of them is concerned. But the actual undertaking of works which are brought to perfection by the hand and its manipulation is the function of those who have been specially trained to deal with a single art.”
Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter I, Sec. 16
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Vitruvius 203
Roman writer, architect and engineer -80–-15 BCRelated quotes

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter I, Sec. 15

Source: Conjectures and Refutations: The Growth of Scientific Knowledge (1963), p. 352
Context: It is often asserted that discussion is only possible between people who have a common language and accept common basic assumptions. I think that this is a mistake. All that is needed is a readiness to learn from one's partner in the discussion, which includes a genuine wish to understand what he intends to say. If this readiness is there, the discussion will be the more fruitful the more the partner's backgrounds differ.
Henry Purcell, Edward Taylor (1843) in "Introduction" to, King Arthur: an opera in 5 acts, written by John Dryden. p. 3; Introduction; Cited in: James Anthony Froude, John Tulloch (1852), Fraser's Magazine, Vol. 45, p. 198

Propositions, 2
also in a letter to 'The World', London 22 Mai, 1878; as quoted in Letters of the great artists – from Blake to Pollock, Richard Friedenthal, Thames and Hudson, London, 1963, p. 186
1870 - 1903, The Gentle Art of Making Enemies' (1890)

An Old Man's Thoughts on Many Things, Of Education I

As quoted in The Jewish Encyclopedia (12 vols. 1901-1906) http://www.jewishencyclopedia.com/view.jsp?artid=905&letter=M
Guide for the Perplexed (c. 1190), Introduction
Context: I have composed this work neither for the common people, nor for beginners, nor for those who occupy themselves only with the Law as it is handed down without concerning themselves with its principles. The design of this work is rather to promote the true understanding of the real spirit of the Law, to guide those religious persons who, adhering to the Torah, have studied philosophy and are embarrassed by the contradictions between the teachings of philosophy and the literal sense of the Torah.

We term sexual activity perverse when it has renounced the aim of reproduction and follows the pursuit of pleasure as an independent goal. And so you realize that the turning point in the development of sexual life lies in its subjugation to the purpose of reproduction. Everything this side of the turning point, everything that has given up this purpose and serves the pursuit of pleasure alone, must carry the term "perverse" and as such be regarded with contempt.
A General Introduction to Psychoanalysis, 1920, preface by G. Stanley Hall, Twentieth Lecture: General Theory of the Neuroses, The Sexual Life of Man, New York, Boni and Liveright, p. 273. (reprinted 1975 by Pocket pub. ISBN 0671800329 ISBN 978-0671800321and 2012 by Emereo Publishing, ISBN 9781486414147 http://books.google.com/books?id=zCgFAQAAIAAJ&pg=PA273&dq=%22common+characteristic+of+all+perversions%22&hl=en&sa=X&ei=VaQtUvq2H4bS9gSy3YCoCQ&ved=0CC8Q6AEwAA#v=onepage&q=%22common%20characteristic%20of%20all%20perversions%22&f=false (Harvard sociologist and a founder of the Rural Sociological Society Carle C. Zimmerman (1897-1983) notes the following in regard to Freud's early thinking on human sexuality: "Nor did the atheist Sigmund Freud perceive any difficulty in detecting the intrinsic perversity of contraception and allied deviations." see, Marriage and the Family, A Text for Moderns, (1956), Carl C. Zimmerman, Ph.D., Lucius F. Cervantes, S.J., PhD. (Harvard, Regis), Regnery, Chicago, Ill., p. 329. http://babel.hathitrust.org/cgi/pt?id=uc1.b4518815;view=1up;seq=347 http://books.google.com/books?id=Jt9-AAAAIAAJ&q=%22common+characteristic+of+all+perversions%22&dq=%22common+characteristic+of+all+perversions%22&hl=en&sa=X&ei=by3cU-y9OsOhyAS2loKgAw&ved=0CCkQ6AEwAg
1920s