Page 152, The Hindu Phenomenon, ISBN 81-86112-32-4.
On Marxism
“People who are liberals look upon the principles of Marxism as abstract dogma. They approve of Marxism, but are not prepared to practice it or to practice it in full; they are not prepared to replace their liberalism by Marxism. These people have their Marxism, but they have their liberalism as well - they talk Marxism but practice liberalism; they apply Marxism to others but liberalism to themselves. They keep both kind of goods in stock and find a use for each. This is how the minds of certain people work.”
Combat Liberalism (1937)
Original: (zh-CN) 自由主义者以抽象的教条看待马克思主义的原则。他们赞成马克思主义,但是不准备实行之,或不准备完全实行之,不准备拿马克思主义代替自己的自由主义。这些人,马克思主义是有的,自由主义也是有的:说的是马克思主义,行的是自由主义;对人是马克思主义,对己是自由主义。两样货色齐备,各有各的用处。这是一部分人的思想方法。
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Mao Zedong 181
Chairman of the Central Committee of the Communist Party of… 1893–1976Related quotes

The Three Sources and Three Component Parts of Marxism http://www.marxists.org/archive/lenin/works/1913/mar/x01.htm (March 1913)
1910s
Context: Throughout the civilised world the teachings of Marx evoke the utmost hostility and hatred of all bourgeois science (both official and liberal), which regards Marxism as a kind of “pernicious sect”. And no other attitude is to be expected, for there can be no “impartial” social science in a society based on class struggle. In one way or another, all official and liberal science defends wage-slavery, whereas Marxism has declared relentless war on that slavery. To expect science to be impartial in a wage-slave society is as foolishly naïve as to expect impartiality from manufacturers on the question of whether workers’ wages ought not to be increased by decreasing the profits of capital.

Source: The Birth of Fascist Ideology: From Cultural Rebellion to Political Revolution, 1994, p. 5

Letter to Maurice Thorez resigning from the French Communist Party, October 24, 1956

Moscou aller-retour. Saint Etienne: De l’Aube, 1995.

Chap. I, The Beginnings of Marxism
“Marxism and Bolshevism: Democracy and Dictatorship,” (1934) http://www.marxists.org/archive/kautsky/1934/bolshevism/index.htm

Adam Schaff (1967) in: "Conversation with Ponzio," in Ponzio 2002; as cited in: Petrilli and Ponzio (2007)