The peoples of the world must have courage, dare to fight, and fear no hardships. When the ones in front fall, the others behind must follow up. In t… - Mao Zedong

什么是知识？自从有阶级的社会存在以来，世界上的知识只有两门，一门叫做生产斗争知识，一门叫做阶级斗争知识。自然科学、社会科学，就是这两门知识的结晶，哲学则是关于自然知识和社会知识的概括和总结。

As for the members of the reactionary classes and individual reactionaries, so long as they do not rebel, sabotage or create trouble after their political power has been overthrown, land and work will be given to them as well in order to allow them to live and remould themselves through labour into new people. If they are not willing to work, the people's state will compel them to work. Propaganda and educational work will be done among them too and will be done, moreover, with as much care and thoroughness as among the captured army officers in the past. This, too, may be called a "policy of benevolence" if you like, but it is imposed by us on the members of the enemy classes and cannot be mentioned in the same breath with the work of self-education which we carry on within the ranks of the revolutionary people.

中国古代有个寓言，叫做“愚公移山”。说的是古代有一位老人，住在华北，名叫北山愚公。他的家门南面有两座大山挡住他家的出路，一座叫做太行山，一座叫做王屋山。愚公下决心率领他的儿子们要用锄头挖去这两座大山。有个老头子名叫智叟的看了发笑，说是你们这样干未免太愚蠢了，你们父子数人要挖掉这样两座大山是完全不可能的。愚公回答说：我死了以后有我的儿子，儿子死了，又有孙子，子子孙孙是没有穷尽的。这两座山虽然很高，却是不会再增高了，挖一点就会少一点，为什么挖不平呢？愚公批驳了智叟的错误思想，毫不动摇，每天挖山不止。这件事感动了上帝，他就派了两个神仙下凡，把两座山背走了。现在也有两座压在中国人民头上的大山，一座叫做帝国主义，一座叫做封建主义。中国共产党早就下了决心，要挖掉这两座山。我们一定要坚持下去，一定要不断地工作，我们也会感动上帝的。这个上帝不是别人，就是全中国的人民大众。全国人民大众一齐起来和我们一道挖这两座山，有什么挖不平呢？