“The permanent revolution, in the sense which Marx attached to this concept, means a revolution which makes no compromise with any single form of class rule, which does not stop at the democratic stage, which goes over to Socialist measures and to war against reaction from without; that is, a revolution whose every successive stage is rooted in the preceding one and which can end only in the complete liquidation of class society.”
The Permanent Revolution (1929)
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Leon Trotsky 106
Marxist revolutionary from Russia 1879–1940Related quotes

As quoted in The Military Programme of the Proletarian Revolution, Collected Works, Vol. 23, pages 78-9.
Attributions

“A revolution is an insurrection, an act of violence by which one class overthrows another.”
Chapter 2 https://www.marxists.org/reference/archive/mao/works/red-book/ch02.htm, originally published in Report on an investigation of the peasant movement in Hunan http://www.marxists.org/reference/archive/mao/selected-works/volume-1/mswv1_2.htm (March 1927), Selected Works, Vol. I, p. 28.
https://www.marxists.org/chinese/big5/nonmarxists/mao/19270300.htm.湖南農民運動考察報告
Quotations from Chairman Mao Zedong (The Little Red Book)
Context: A revolution is not a dinner party, or writing an essay, or painting a picture, or doing embroidery. It cannot be so refined, so leisurely and gentle, so temperate, kind, courteous, restrained and magnanimous. A revolution is an insurrection, an act of violence by which one class overthrows another.

As quoted in With Fidel : A Portrait of Castro and Cuba (1976) by Frank Mankiewicz and Kirby Jones, p. 83
As quoted in Words of Wisdom : From the Greatest Minds of All Time (2004) edited by Mick Farren, p. 138
Variant: The revolution is a dictatorship of the exploited against the exploiters.