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Self-criticism, cruel, unsparing criticism that goes to the very root of the evil, is life and breath for the proletarian movement.
Source: The Crisis in the German Social Democracy, 1919.
-- Rosa Luxemburg, (Mar 5 1871-1919), Polish-German socialist, writer; Bloody Rosa played a key role in the founding of the Polish Social Democratic Party and the Spartacus party, 1918.