"The food of the true revolutionary is the red pepper, And he who cannot endure red peppers is also unable to fight." - Otto Braun memoirs - Mao Zedong

Marxists remain a minority among the entire population as well as among the intellectuals. Therefore, Marxism must continue to develop through struggle. Marxism can develop only through struggle, and this is not only true of the past and the present, it is necessarily true of the future as well. What is correct invariably develops in the course of struggle with what is wrong. The true, the good and the beautiful always exist by contrast with the false, the evil and the ugly, and grow in struggle with them. As soon as something erroneous is rejected and a particular truth accepted by mankind, new truths begin to struggle with new errors. Such struggles will never end. This is the law of development of truth and, naturally, of Marxism.

谁是我们的敌人？谁是我们的朋友？这个问题是革命的首要问题. (Shéi shì wǒmen de dírén? Shéi shì wǒmen de péngyǒu? Zhège wèntí shì gémìng de shǒuyào wèntí.)

如果有了正确的理论，只是把它空谈一阵，束之高阁，并不实行，那末，这种理论再好也是没有意义的。认识从实践始，经过实践得到了理论的认识，还须再回到实践去。认识的能动作用，不但表现于从感性的认识到理性的认识之能动的飞跃，更重要的还须表现于从理性的认识到革命的实践这一个飞跃。抓着了世界的规律性的认识，必须把它再回到改造世界的实践中去，再用到生产的实践、革命的阶级斗争和民族斗争的实践以及科学实验的实践中去。