Historical experience demonstrates that triumphant development of the cause of proletarian revolution depends on the correctness and soundness of the Party's political line. Basically, the continuous sequence of victories of China's proletarian revolutionary cause is the result of the continuity between Chairman Mao's Marxist-Leninist line and the triumphant suppression of the Right and "Left" opportunistic lines. In guiding the course of China's revolution, our exceptionally great teacher and leader Chairman Mao, from the beginning placed comprehensive emphasis on the problem of (...) inner-Party struggle. Particularly concerning the period after the advance into the socialist revolutionary stage and our Party's assumption of power, Chairman Mao acutely and systematically summed up the historical experience of the dictatorship of the proletariat in both domestic and international affairs and clarified the relationship between socialist revolution and inner-Party struggle. He thereby further advanced Marxist theory of inner-Party line struggle. To learn from this exceptionally great theory has great significance with respect to our persevering in continuing revolution under the dictatorship of the proletariat, precisely grasping and developing inner-Party line struggle, and ceaselessly building up the Party's strength. (shrink)