| http://www.w3.org/ns/prov#value | - The Marxist theory of knowledge, as set forth by Marx (Thesis on Feuerbach), Engels (Socialism, Utopian and Scientific; Anti-Duhring), Lenin (Materialism and Empirio-Criticism), Stalin (Foundations of Leninism), and Mao (On Practice)[3], holds that practice and practice alone is the test of theory.
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