《知堂书话》中有一篇《灯下读书论》，说到：“古人劝人读书，常说他的乐趣，如《四时读书乐》所广说，读书之乐乐陶陶，至今暗诵起几句来，也还觉得有意思。此外的一派是说读书有利益，如云书中自有黄金屋，书中自有颜如玉，是升官发财主义的代表，便是唐朝作《原道》的韩文 There is an article entitled “Reading the Lamp under the Light in the Book of Tomorrow”, saying: “The ancients advised people to read books and often said that his pleasure, such as” Chanting a few, but also find it interesting.Another faction is that there are interests in reading books, such as the Golden Book own house of gold, the book of its own, such as jade, is representative of promotion of wealth, that is, the Tang Dynasty as "the original Road Korean