Attributed to Charles Eames in: Georgia Bizios (1998) Architecture Reading Lists and Course Outlines. p. 494
“The quality of a play is the quality of its ideas.”
"The Play of Ideas", New Statesman (6 May 1950)
1940s and later
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George Bernard Shaw 413
Irish playwright 1856–1950Related quotes

Source: The True Believer: Thoughts on the Nature of Mass Movements

Source: Philosophy of Education, p. 86.

“Quantity has a quality all its own.”
No evidence that this phrasing is due to Stalin, and it does not appear in English translations of his philosphical works. Earliest English is found in 1979 in US defense industry, presumably defense consultant Thomas A. Callaghan Jr. The connection of sufficient quantitative change leading to qualitative change is found in Marxist philosophy, by Marx and Engels, drawing from Hegelian philosophy and Ancient Greek philosophy. Marx and Engels are quoted by Stalin, but this formulation appears to be a modern American form; see quantity for details.
Stalin may have said that way before World War II, there is evidence in his Russian-language books, for example here http://www.modernlib.ru/books/stalin_iosif_vissarionovich/tom_14/read_16/.
Misattributed
Variant: Quantity is quality.
Source: Re: "Quantity has a quality all its own" source? http://h-net.msu.edu/cgi-bin/logbrowse.pl?trx=vx&list=h-russia&month=1004&week=a&msg=ljEwsM4dMrpmUGVfI7EGqg, Tim Davenport, h-russia https://networks.h-net.org/h-russia, April 5, 2010

"The Idea of Justice in the Holy Scriptures", Rivista Juridicade la Universidadde Puerto Rico, Sept., 1952-April, 1953., published in What is Justice? (1957)
“Quality men are not afraid of quality women.”
30% (Women and Politics in Sierra Leone), Anna Cady, 2018-06-18 https://vimeo.com/43595116,

“The fortunes of a nation are determined above everything by the quality of its people.”
Speech at Douglas Castle, Lanarkshire, Scotland (27 August 1927), quoted in Our Inheritance (London: Hodder and Stoughton, 1938), p. 129.
1927

“The test of the moral quality of a civilization is its treatment of the weak and powerless.”
United States ex rel. Caminito v. Murphy, 222 F.2d 698, 706 (1955).
"Getting on with It" (p.103)
There's a Country in My Cellar (1990)