Basic Economic System Educational Activity of "Three Stresses" (Study, Politics, Integrity) Marx and Engels’ Theory of Ideology The Debate Between the Deborinism and Mechanism Schools Jean Charles Léonard Simonde de Sismondi (1773–1842) The Living Soul of Mao Zedong Thought Karl Grün (1817–1887) On Politics Worth of Man We Will Not Attack Unless We Are Attacked; If We Are Attacked, We Will Certainly Counterattack