共产主义是无产阶级的整个思想体系，同时又是一种新的社会制度。这种思想体系和社会制度，是区别于任何别的思想体系和任何别的社会制度的，是自有人类历史以来，最完全最进步最革命最合理的。封建主义的思想体系和社会制度，是进了历史博物馆的东西了。资本主义的思想体系和社会制度，已有一部分进了博物馆（在苏联）；其… - Mao Zedong

Marxism comprises many principles, but in the final analysis they can all be brought back to a single sentence: it is right to rebel.

Active defence is also known as offensive defence, or defence through decisive engagements. Passive defence is also known as purely defensive defence or pure defence. Passive defence is actually a spurious kind of defence, and the only real defence is active defence, defence for the purpose of counter-attacking and taking the offensive. As far as I know, there is no military manual of value nor any sensible military expert, ancient or modern, Chinese or foreign, that does not oppose passive defence, whether in strategy or tactics. Only a complete fool or a madman would cherish passive defence as a talisman.

Medical education should be reformed. There’s no need to read so many books. How many years did Hua Tuo spend at college? How many years’ education did Li Shizhen of the Ming dynasty receive? In medical education there is no need to accept only higher middle school graduates or lower middle school graduates. It will be enough to give three years to graduates from higher primary schools. They would then study and raise their standards, mainly through practice. If this kind of doctor is sent down to the countryside, even if they haven’t much talent, they would be better than quacks and witch doctors and the villages would be better able to afford to keep them. The more books one reads, the more stupid one gets. The methods of medical examination and treatment used by hospitals nowadays are not at all appropriate for the countryside, and the way doctors are trained is only for the benefit of the cities. And yet in China over 500 million of our population are peasants.