“Liberalism is extremely harmful in a revolutionary collective. It is a corrosive which eats away unity, undermines cohesion causes apathy and creates dissension. It robs the revolutionary ranks of compact organization and strict discipline, prevents policies from being carried through and alienates the Party organization from the masses which the Party leads. It is an extremely bad tendency.”
Combat Liberalism (1937)
Original
革命的集体组织中的自由主义是十分有害的。它是一种腐蚀剂,使团结涣散,关系松懈,工作消极,意见分歧。它使革命队伍失掉严密的组织和纪律,政策不能贯彻到底,党的组织和党所领导的群众发生隔离。这是一种严重的恶劣倾向。
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Mao Zedong 181
Chairman of the Central Committee of the Communist Party of… 1893–1976Related quotes

Directives on the Cultural Revolution (1966-1972)

Source: 1970s-1980s, The Limits Of Organization (1974), Chapter 1, Rationality: Individual And Social, p. 26

“The Communist Party must be a revolutionary party our it will cease to be a Communist Party.”
Tim Buck A Conscience for Canada

From Naţionalitatea în artă ("Nationality in Art"), Bucureşti: Cartea Romaneasca, 1905.

"Rectify the Party's Style of Work" (1942)
Original: (zh-CN) 为什么要有革命党?因为世界上有压迫人民的敌人存在,人民要推翻敌人的压迫,所以要有革命党。就资本主义和帝国主义时代说来,就需要一个如共产党这样的革命党。如果没有共产党这样的革命党,人民要想推翻敌人的压迫,简直是不可能的。我们是共产党,我们要领导人民打倒敌人,我们的队伍就要整齐,我们的步调就要一致,兵要精,武器要好。如果不具备这些条件,那末,敌人就不会被我们打倒。

Source: The Foundations of Leninism, Ch.8