"Open the book" means opening the book, which means reading. Metaphor is good for reading.
traditional culture
After Song Taizong unified the whole country, it was determined to carry forward the traditional culture and ordered to sort out all kinds of ancient books. At the same time, it also attaches importance to the collection of various ancient cultural materials.
Magnolia pacifica
Seven or eight of the ten ancient books cited in Taiping Yu Lan are now out of sight. So it can be said that it is a collection of cultural knowledge before the Northern Song Dynasty.
Reading income
Song Taizong's political affairs are very busy. He often fails to read this book as planned because he is dealing with other things, so he makes up reading in his spare time. The courtiers were afraid that he would study too long and affect his health. Taizong said, "As long as I open a book to read, I will get benefits, so I don't feel tired."
Reading is useful.
Reading is always good. Metaphor is good for reading.