Source: Transforming qualitative information (1998), p. as cited in: Graciela Tonon (2012) Young People's Quality of Life and Construction of Citizenship. p. 53.
“Qualitatively different contradictions can only be resolved by qualitatively different methods.”
On Contradiction (1937)
Original: (zh-CN) 不同质的矛盾,只有用不同质的方法才能解决。
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Mao Zedong 181
Chairman of the Central Committee of the Communist Party of… 1893–1976Related quotes
“Money expresses all qualitative differences of things in terms of "how much?"”
Money, with all its colorlessness and indifference, becomes the common denominator of all values; irreparably it hollows out the core of things, their individuality, their specific value, and their incomparability. All things float with equal specific gravity in the constantly moving stream of money. All things lie on the same level and differ from one another only in the size of the area which they cover.
The Metropolis and Mental Life (1903)
" Children Really are Not People http://books.google.com/books?id=w0FnrZaKX7MC&q=%22Children+are+different+mentally+physically+spiritually+quantitatively+qualitatively+and+furthermore+they're+all+a+little+bit+nuts%22&pg=PA157#v=onepage," Please Don't Eat the Daisies, The Saturday Evening Post, 27 July 1957 http://books.google.com/books?id=0QkfAQAAMAAJ&q=%22Children+are+different+mentally+physically+spiritually+quantitatively+qualitatively+and+furthermore+they're+all+a+little+bit+nuts%22&pg=PA17#v=onepage
Please Don't Eat the Daisies (1957)

Source: 1840s, Two Ethical-Religious Minor Essays (1849), P. 90-91

Internet Encyclopedia of Philosophy
Context: Poetic truth is different from scientific truth since it reveals the real in its qualitative uniqueness and not in its quantitative universality. Poetry is the language of the soul, while prose is the language of science. The former is the language of mystery, of devotion, of religion. Prose lays bare its whole meaning to the intelligence, while poetry plunges us in the mysterium tremendum of life and suggests the truths that cannot be stated.

Talk at an Enlarged Central Work Conference (30 January 1962)
1960s
Original: (zh-CN) 批评和自我批评是一种方法,是解决人民内部矛盾的方法,而且是唯一的方法。
Source: Information Systems (1973), p. 331; As cited in: Lyn Robinson and David Bawden (2011).

On the Correct Handling of Contradictions Among the People
Original: (zh-CN) 在一九四二年,我们曾经把解决人民内部矛盾的这种民主的方法,具体化为一个公式,叫做“团结——批评——团结”。讲详细一点,就是从团结的愿望出发,经过批评或者斗争使矛盾得到解决,从而在新的基础上达到新的团结。按照我们的经验,这是解决人民内部矛盾的一个正确的方法。
J. R. Partington, Higher Mathematics for Chemical Students (1911)

Source: Quotes 1960s-1980s, 1980s, Rules and Representations (1980), p. 2-3 as cited in: Jerry Fodor (1983) Modularity of Mind: An Essay on Faculty Psychology. p. 4.