“Rest comes not from the quantity but from the quality of sleep.”
Aphorisms
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G. I. Gurdjieff 62
influential spiritual teacher, Armenian philosopher, compos… 1866–1949Related quotes

Arithmetica Universalis (1707)
Context: Whereas in Arithmetick Questions are only resolv'd by proceeding from given Quantities to the Quantities sought, Algebra proceeds in a retrograde Order, from the Quantities sought as if they were given, to the Quantities given as if they were sought, to the End that we may some Way or other come to a Conclusion or Æquation, from which one may bring out the Quantity sought. And after this Way the most difficult problems are resolv'd, the Resolutions whereof would be sought in vain from only common Arithmetick. Yet Arithmetick in all its Operations is so subservient to Algebra, as that they seem both but to make one perfect Science of Computing; and therefore I will explain them both together.<!--pp.1-2

“Quality comes not from inspection, but from improvement of the production process.”
Source: Out Of The Crisis (1982), p. 29
Cosmographie (1657)

“Love is a quality, not a quantity.”
Shades of the World (1985)

“It is quality rather than quantity that matters.”
Non refert quam multos sed quam bonos habeas.
Source: Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter XLV: On sophistical argumentation, Line 1

“To me, it's always about quality not quantity.”
Lee explaining why she's not releasing her music "too often" in the show small talk

19th World Vegetarian Congress 1967

“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