没有民主，不可能有正确的集中，因为大家意见分歧，没有统一的认识，集中制就建立不起来。什么叫集中？首先是要集中正确的意见。在集中正确意见的基础上，做到统一认识，统一政策，统一计划，统一指挥，统一行动，叫做集中统一。如果大家对问题还不了解，有意见还没有发表，有气还没有出，你这个集中统一怎么建立得起来呢… - 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。

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.

下定决心，不怕牺牲，排除万难，去争取胜利。