1
Personally, I think the author elaborates the idea that reading is better than external beauty, and that inner beauty is better than outer beauty. Elegance is better than vulgar appearance.
2
The intention is to cause the following, and contrast strongly with the latter.
3 When reading, one is focused. Because you are listening to some noble soul talking to itself, one can't help but be humble and attentive. When you read, you often smile. The wisdom and splendor, the wisdom and penetration, make us flick the page and spread our faces in awe.
4
The use of poetic words explains the attractiveness of the book's plot, which makes you linger in it and can't help yourself. It also elaborates on the benefits of reading a book that is enjoyable alone.