1938年3月15日,毛泽东同志在抗大三大队毕业典礼上,对学员们说:“社会是学校,一切在工作中学习。学习的书有两种:有字的讲义是书,社会上的一切也是书,无字天书。”他自己在几十年的革命历程中,不仅视书本为生命,直到临终之前还没有放弃阅读;而且,同时也特别重视社会实践,积极提倡到社会中调查,向普通民众学习,吸收各方面活的知识, On March 15, 1938, Comrade Mao Tse-tung said to the trainees at the graduation ceremony of the Third Brigade against Corps: “Society is a school and everything is at work. There are two kinds of books for study: Everything on the book is also a book, no word book. ”" In his decades of revolutionary history, not only books as life, did not give up reading until the dying, but also pay special attention to social practice, and actively promote the community In the investigation, to learn from the general public, to absorb all aspects of living knowledge,