Mao Zedong: Class struggle, the struggle for production and scientific experiment are the three great revolutionary movements for building a mighty socialist country. These movements are a sure guarantee that communists will be free from bureaucracy and immune against revisionism and dogmatism, and will forever remain invincible. They are a reliable guarantee that the proletariat will be able to unite with the broad working masses and realize a democratic dictatorship. If in the absence of these movements, the landlords, rich peasants, counter-revolutionaries, bad elements and monsters of all kinds were allowed to crawl out, while our cadres were to shut their eyes to all this and in many cases fail even to differentiate between the enemy and ourselves but were to collaborate with the enemy and were corrupted, divided and demoralized by him, if our cadres were thus pulled out or the enemy were able to sneak in, and if many of our workers, peasants and intellectuals were left defenseless against both the soft and the hard tactics of the enemy, then it would not take long, perhaps only several years or a decade, or several decades at most, before a counter-revolutionary restoration on a national scale inevitably occurred, the Marxist-Leninist party would undoubtedly become a revisionist party or fascist party, and the whole of China would change its colour. https://wordsmith.social/protestation/quotes#quote9343