"One ought to avoid all unnecessary worry and exciting thoughts, and to cultivate a firm tranquility of mind. Melancholy reflections will in no way influence fate, whereas one may weaken the constitution by the waste of energy while indulging in them."

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Conditions are changing all the time, and to adapt one's thinking to the new conditions, one must study. Even those who have a better grasp of Marxism and are comparatively firm in their proletarian stand have to go on studying, have to absorb what is new and study new problems.

— Mao Zedong