The theory of Marx, Engels, Lenin and Stalin is universally applicable. We should regard it not as a dogma, but as a guide to action. Studying it is not merely a matter of learning terms and phrases but of learning Marxism-Leninism as the science of revolution. It is not just a matter of understanding the general laws derived by Marx, Engels, Lenin and Stalin from their extensive study of real life and revolutionary experience, but of studying their standpoint and method in examining and solving problems.
Mao ZedongNew things always have to experience difficulties and setbacks as they grow. It is sheer fantasy to imagine that the cause of socialism is all plain sailing and easy success, without difficulties and setbacks or the exertion of tremendous efforts.
Mao ZedongLet the ancient serve the present, let the foreign serve the national; by developing that which has been accomplished one creates something that is new.
Mao Zedong