“The passing of state power from one class to another is the first, the principal, the basic sign of a revolution, both in the strictly scientific and in the practical political meaning of that term.”
Collected Works, Vol. 24, pp. 42–54.
Collected Works
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Vladimir Lenin 336
Russian politician, led the October Revolution 1870–1924Related quotes

A Wayne. Wymore (2004) " The nature of research in systems engineering http://sse.stevens.edu/fileadmin/cser/2004/papers/211-Paper119.pdf"; As cited in: Eric David Smith (2006) Tradeoff Studies and Cognitive Biases. p. 31.

"The Criminality of the State" in American Mercury (March 1939). A similar statement was later made by Jerry Ford

Faith for Living (1940)
Source: Signs, Language and Behavior, 1946, p. 19

This fact must be grasped first and foremost: unless it is understood, we cannot advance. We must know how to supplement and amend old "formulas".
Lenin Anthology, p. 301
1910s, "The Dual Power" (1917)

“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.