If you want to learn something, the knowledge in optical books is not enough, but you should practice it yourself: what you get on paper is superficial after all, and you will never know.

note:

Lu You reads books in winter nights and shows them to children.

The ancients learned nothing, and it takes time to grow old.

What you get on paper is so shallow that you never know what you have to do.

The ancients spared no effort in their studies, studying hard when they were young until they achieved something in their old age. What you learn from books always feels superficial. If you really want to understand it, you must practice it yourself.

Thinking of Lu You's feeling of reading on a winter night, he wrote eight poems to his youngest son. This is the third poem. On the one hand, this poem emphasizes the importance of persistent learning, on the other hand, it emphasizes the importance of social practice. Because the knowledge learned from books, even if it is true and correct, is estranged from yourself. Without personal practice, you can't understand the knowledge in books well. Therefore, in the process of learning, personal practice is extremely important.

I hope I can help you!