On Contradiction (1937)
Original: (zh-CN) 党内不同思想的对立和斗争是经常发生的，这是社会的阶级矛盾和新旧事物的矛盾在党内的反映。党内如果没有矛盾和解决矛盾的思想斗争，党的生命也就停止了。
“As already mentioned, so long as classes exist, contradictions between correct and incorrect ideas in the Communist Party are reflections within the Party of class contradictions. At first, with regard to certain issues, such contradictions may not manifest themselves as antagonistic. But with the development of the class struggle, they may grow and become antagonistic. The history of the Communist Party of the Soviet Union shows us that the contradictions between the correct thinking of Lenin and Stalin and the fallacious thinking of Trotsky, Bukharin and others did not at first manifest themselves in an antagonistic form, but that later they did develop into antagonism.”
—
Mao Zedong
,
book
On Contradiction
On Contradiction (1937)
Original: (zh-CN) 共产党内正确思想和错误思想的矛盾，如前所说，在阶级存在的时候，这是阶级矛盾对于党内的反映。这种矛盾，在开始的时候，或在个别的问题上，并不一定马上表现为对抗性的。但随着阶级斗争的发展，这种矛盾也就可能发展为对抗性的。苏联共产党的历史告诉我们：列宁、斯大林的正确思想和托洛茨基、布哈林等人的错误思想的矛盾，在开始的时候还没有表现为对抗的形式，但随后就发展为对抗的了。中国共产党的历史也有过这样的情形。我们党内许多同志的正确思想和陈独秀、张国焘等人的错误思想的矛盾，在开始的时候也没有表现为对抗的形式，但随后就发展为对抗的了。目前我们党内的正确思想和错误思想的矛盾，没有表现为对抗的形式，如果犯错误的同志能够改正自己的错误，那就不会发展为对抗性的东西。因此，党一方面必须对于错误思想进行严肃的斗争，另方面又必须充分地给犯错误的同志留有自己觉悟的机会。在这样的情况下，过火的斗争，显然是不适当的。但如果犯错误的人坚持错误，并扩大下去，这种矛盾也就存在着发展为对抗性的东西的可能性
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Mao Zedong
(1893–1976) Chairman of the Central Committee of the Communist Party of China
On the Correct Handling of Contradictions Among the People
Original: (zh-CN) 敌我之间的矛盾是对抗性的矛盾。人民内部的矛盾，在劳动人民之间说来，是非对抗性的；在被剥削阶级和剥削阶级之间说来，除了对抗性的一面以外，还有非对抗性的一面。
On Contradiction (1937)
Xi Jinping
(1953) General Secretary of the Communist Party of China and paramount leader of China
As quoted in " Xi Jinping’s quest to revive Stalin’s communist ideology https://www.washingtonpost.com/news/global-opinions/wp/2017/10/16/xi-jinpings-quest-to-revive-stalins-communist-ideology/?utm_term=.a350d0a610c0" Washington Post
2010s
Hugo, Act 5, sc. 3
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The Green Book (1975)
The Green Book (1975)
Context: Any class which becomes heir to a society, inherits, at the same time, its characteristics. That is to say that if the working class crushes all other classes, for instance, it becomes heir of the society, that is, it becomes the material and social base of the society. The heir bears the traits of the one he inherits from, though they may not be evident at once. As time passes, attributes of other eliminated classes emerge in the very ranks of the working class. And the possessors of those characteristics take the attitudes and points of view appropriate to their characteristics. Thus the working class turns out to be a separate society, showing the same contradictions as the old society.
Mao Zedong
(1893–1976) Chairman of the Central Committee of the Communist Party of China
Directives on the Cultural Revolution (1966-1972)
On Contradiction (1937)
Original: (zh-CN) 人的概念的每一差异，都应把它看作是客观矛盾的反映。客观矛盾反映入主观的思想，组成了概念的矛盾运动，推动了思想的发展，不断地解决了人们的思想问题。
“... You have discovered the class struggle, or rather its reflection, in the ranks of the party.”
Max Shachtman
(1904–1972) American Marxist theorist
The Crisis in the American Party: An Open Letter in Reply to Comrade Leon Trotsky http://www.marxists.org/archive/shachtma/1940/03/crisis.htm, March 1940