Source: The Human Side of Enterprise (1960), p. 16 (p. 23 in 2006 edition)
“The instrument of expansion of Classical civilization was a social organization, slavery.”
Source: The Evolution of Civilizations (1961) (Second Edition 1979), Chapter 9, Classical Civilization, p. 270
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Carroll Quigley 79
American historian 1910–1977Related quotes

Source: 2010s, Why the Left Hates America (2015)

"One culture and the new sensibility", p. 296
Against Interpretation and Other Essays (1966)
Context: Art today is a new kind of instrument, an instrument for modifying consciousness and organizing new modes of sensibility. And the means for practicing art have been radically extended.... Painters no longer feel themselves confined to canvas and paint, but employ hair, photographs, wax, sand, bicycle tires, their own toothbrushes and socks. Musicians have reached beyond the sounds of the traditional instruments to use tampered instruments and (usually on tape) synthetic sounds and industrial noises.

James M. McPherson "James McPherson: What They Fought For, 1861–1865" https://web.archive.org/web/20160309201904/http://www.booknotes.org/FullPage.aspx?SID=55946-1 (22 May 1994), Booknotes, United States of America: National Cable Satellite Corporation
1990s

The Socialist Party and the Working Class (1904)

“All socialism involves slavery.”
The Man versus the State (1884), The Coming Slavery
Context: Influences of various kinds conspire to increase corporate action and decrease individual action. And the change is being on all sides aided by schemers, each of whom thinks only of his pet plan and not at all of the general reorganization which his plan, joined with others such, are working out. It is said that the French Revolution devoured its own children. Here, an analogous catastrophe seems not unlikely. The numerous socialistic changes made by Act of Parliament, joined with the numerous others presently to be made, will by-and-by be all merged in State-socialism—swallowed in the vast wave which they have little by little raised.
"But why is this change described as 'the coming slavery'?," is a question which many will still ask. The reply is simple. All socialism involves slavery.

Source: The Montessori Method Scientific Pedagogy as Applied to Child Education in 'The Children's Houses' with Additions and Revisions by the Author

Source: Democracy for the Few (2010 [1974]), sixth edition, Chapter 16, p. 298