Long Fang is a Dutch-American and a famous scholar. He has rich life experiences. He has lived in various posts, studied hard to write and was versatile. He can speak and write 65,438+00 languages, play the violin and draw pictures. The illustrations of his works are all from his own hands. And there is a pursuit and a firm belief. The purpose of introducing these is to guide students to think and get some inspiration from them. The book Tolerance mainly describes the history of the development of human thought, advocates ideological emancipation and advocates tolerance of dissidents. Why should we tolerate dissent? The preface gives an implicit answer. Introducing this point is helpful for students to understand the center of this article.