“It is essential to grasp the incontestable truth that a Marxist must take cognisance of real life, of the true facts of reality, and not cling to a theory of yesterday, which, like all theories, at best only outlines the main and the general, only comes near to embracing life in all its complexity.”

—  Vladimir Lenin

Letters on Tactics (April 1917) http://www.marxists.org/archive/lenin/works/1917/apr/x01.htm; Collected Works, Vol. 24.
1910s

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Vladimir Lenin 336
Russian politician, led the October Revolution 1870–1924

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