国际主义者的共产党员，是否可以同时又是一个爱国主义者呢？我们认为不但是可以的，而且是应该的。 - Mao Zedong

According to materialist dialectics, changes in nature are due chiefly to the development of the internal contradictions in nature. Changes in society are due chiefly to the development of the internal contradictions in society, that is, the contradiction between the productive forces and the relations of production, the contradiction between classes and the contradiction between the old and the new; it is the development of these contradictions that pushes society forward and gives the impetus for the supersession of the old society by the new. Does materialist dialectics exclude external causes? Not at all. It holds that external causes are the condition of change and internal causes are the basis of change, and that external causes become operative through internal causes. In a suitable temperature an egg changes into a chicken, but no temperature can change a stone into a chicken, because each has a different basis. There is constant interaction between the peoples of different countries. In the era of capitalism, and especially in the era of imperialism and proletarian revolution, the interaction and mutual impact of different countries in the political, economic and cultural spheres are extremely great. The October Socialist Revolution ushered in a new epoch in world history as well as in Russian history. It exerted influence on internal changes in the other countries in the world and, similarly and in a particularly profound way, on internal changes in China. These changes, however, were effected through the inner laws of development of these countries, China included. In battle, one army is victorious and the other is defeated, both the victory and the defeat are determined by internal causes.

Communism is at once a complete system of proletarian ideology and a new social system. It is different from any other ideology or social system, and is the most complete, progressive, revolutionary and rational system in human history. The ideological and social system of feudalism has a place only in the museum of history. The ideological and social system of capitalism has also become a museum piece in one part of the world (in the Soviet Union), while in other countries it resembles "a dying person who is sinking fast, like the sun setting beyond the western hills", and will soon be relegated to the museum. The communist ideological and social system alone is full of youth and vitality, sweeping the world with the momentum of an avalanche and the force of a thunderbolt. The introduction of scientific communism into China has opened new vistas for people and has changed the face of the Chinese revolution. Without communism to guide it, China's democratic revolution cannot possibly succeed, let alone move on to the next stage. This is the reason why the bourgeois die-hards are so loudly demanding that communism be "folded up". But it must not be "folded up", for once communism is "folded up", China will be doomed. The whole world today depends on communism for its salvation, and China is no exception.

我党规定了中国革命的总路线和总政策，又规定了各项具体的工作路线和各项具体的政策。但是，许多同志往往记住了我党的具体的个别的工作路线和政策，忘记了我党的总路线和总政策。而如果真正忘记了我党的总路线和总政策，我们就将是一个盲目的不完全的不清醒的革命者，在我们执行具体工作路线和具体政策的时候，就会迷失方向，就会左右摇摆，就会贻误我们的工作。