马克思主义者不应该害怕任何人批评。相反，马克思主义者就是要在人们的批评中间，就是要在斗争的风雨中间，锻炼自己，发展自己，扩大自己的阵地。同错误思想作斗争，好比种牛痘，经过了牛痘疫苗的作用，人身上就增强免疫力。在温室里培养出来的东西，不会有强大的生命力。实行百花齐放、百家争鸣的方针，并不会削弱马克思… - Mao Zedong

However, we must make a concrete study of the circumstances of each specific struggle of opposites and should not arbitrarily apply the formula discussed above to everything. Contradiction and struggle are universal and absolute, but the methods of resolving contradictions, that is, the forms of struggle, differ according to the differences in the nature of the contradictions. Some contradictions are characterized by open antagonism, others are not. In accordance with the concrete development of things, some contradictions which were originally non-antagonistic develop into antagonistic ones, while others which were originally antagonistic develop into non-antagonistic ones.

指导战争的人们不能超越客观条件许可的限度期求战争的胜利，然而可以而且必须在客观条件的限度之内，能动地争取战争的胜利。战争指挥员活动的舞台，必须建筑在客观条件的许可之上，然而他们凭借这个舞台，却可以导演出很多有声有色、威武雄壮的戏剧来。

It is absolutely necessary for educated young people to go to the countryside to be re-educated by the poor and lower-middle peasants. Cadres and other city people should be persuaded to send their sons and daughters who have finished junior or senior middle school, college, or university to the countryside. Let us mobilize. Comrades throughout the countryside should welcome them.