“The dictatorship of the proletariat which has risen to power as the leader of the democratic revolution is inevitably and, very quickly confronted with tasks, the fulfillment of which is bound up with deep inroads into the rights of bourgeois property. The democratic revolution grows over directly into the socialist revolution and thereby becomes a permanent revolution.”
Source: The Permanent Revolution (1929), Ch. 10
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Leon Trotsky 106
Marxist revolutionary from Russia 1879–1940Related quotes
Source: The Managerial Revolution, 1941, p. 220–221; As cited in Marcel van der Linden (2007, p. 83)

On New Democracy (1940)
Original: (zh-CN) 这种新民主主义共和国,一方面和旧形式的、欧美式的、资产阶级专政的、资本主义的共和国相区别,那是旧民主主义的共和国,那种共和国已经过时了;另一方面,也和苏联式的、无产阶级专政的、社会主义的共和国相区别,那种社会主义的共和国已经在苏联兴盛起来,并且还要在各资本主义国家建立起来,无疑将成为一切工业先进国家的国家构成和政权构成的统治形式;但是那种共和国,在一定的历史时期中,还不适用于殖民地半殖民地国家的革命。因此,一切殖民地半殖民地国家的革命,在一定历史时期中所采取的国家形式,只能是第三种形式,这就是所谓新民主主义共和国。这是一定历史时期的形式,因而是过渡的形式,但是不可移易的必要的形式。

(1847)

“Liberalization and democratization are in essence counter-revolution.”
Quoted in "Armageddon Averted: The Soviet Collapse" - Page 58 - by Stephen Kotkin - History - 2001

The Foundations of Leninism

Original Spanish: "Compañeros obreros y campesinos, esta es la Revolución socialista y democrática de los humildes, con los humildes y para los humildes. Y por esta Revolución de los humildes, por los humildes y para los humildes estamos dispuestos a dar la vida."
On 16 April 1961, in a funeral oration in Vedado for victims of the air raids the day before, Fidel Castro referring to the January 1959 Cuban Revolution. Quoted in José Ramón Fernández. 2001. Playa Giron/Bay of Pigs: Washington's First Military Defeat in the Americas, p. 56