国家的统一，人民的团结，国内各民族的团结，这是我们的事业必定要胜利的基本保证。但是，这并不是说在我们的社会里已经没有任何的矛盾了。没有矛盾的想法是不符合客观实际的天真的想法。在我们的面前有两类社会矛盾，这就是敌我之间的矛盾和人民内部的矛盾。这是性质完全不同的两类矛盾。 - Mao Zedong

In approaching a problem a Marxist should see the whole as well as the parts. A frog in a well says, "The sky is no bigger than the mouth of the well." That is untrue, for the sky is not just the size of the mouth of the well. If it said, "A part of the sky is the size of the mouth of a well", that would be true, for it tallies with the facts. What we say is that in one respect the Red Army has failed (i.e., failed to maintain its original positions), but in another respect it has won a victory (i.e., in executing the plan of the Long March). In one respect the enemy won a victory (i.e., in occupying our original positions), but in another respect he has failed (i.e., failed to execute his plan of “encirclement ant suppression” and of “pursuit and suppression”). That is the only appropriate formulation, for we have completed the Long March.

As already mentioned, so long as classes exist, contradictions between correct and incorrect ideas in the Communist Party are reflections within the Party of class contradictions. At first, with regard to certain issues, such contradictions may not manifest themselves as antagonistic. But with the development of the class struggle, they may grow and become antagonistic. The history of the Communist Party of the Soviet Union shows us that the contradictions between the correct thinking of Lenin and Stalin and the fallacious thinking of Trotsky, Bukharin and others did not at first manifest themselves in an antagonistic form, but that later they did develop into antagonism.

凡是敵人反對的，我們就要擁護；凡是敵人擁護的，我們就要反對。 (Fánshì dírén fǎnduì de, wǒmen jiù yào yǒnghù; fánshì dírén yǒnghù de, wǒmen jiù yào fǎnduì.)