One word from Chairman Mao is worth ten thousand from others. His every statement is truth. We must carry out those we that understand as well as those we don't.
Taking the entire globe, if North America and Western Europe can be called the 'cities of the world', then Asia, Africa and Latin America constitute 'the rural areas of the world'.
In the final analysis, the whole cause of world revolution hinges on the revolutionary struggles of the Asian, African and Latin American people who make up the overwhelming majority of the world's population.