What is the meaning of the whole sentence "learn extensively and take about it, accumulate a lot but make little progress"?

Meaning: read extensively, take it simply and carefully, and release it slowly after deep accumulation.

from: Song Sushi's "Jia Shuo Send Zhang Hu"

Excerpt from the original text:

I am also interested in learning. Unfortunately, I was in the same year as my son, and my son got it, which is not too early. Although I want to think that I am inadequate today, many people have already pushed it. Whoo! My son is going here, and business studies are also good! Take a broad view and make an appointment, accumulate a lot but make little progress, and my son will stop here.

Definition:

I have the ambition to study hard since I was a child, but I didn't expect to be in the scientific research with you early, but your success can't be said too early! Although I think that I am not enough now, everyone has praised me at random. Alas, you should get rid of this situation and devote yourself to learning! I read extensively, take it simply and carefully, and release it slowly after deep accumulation. I can warn you so much. Extended information

Main idea of the article:

The full text begins with planting crops, and compares the farming environment, farming methods and harvest results of poor and rich people, paving the way for the following study; The following article focuses on the relationship between scholarship and planting crops, and then reveals the main idea of the article: planting crops can not be harvested until they are mature; Learning should be broad-minded and about taking, and accumulated but thin.

Author's achievements:

Su Shi has a high erudition, and his mastery of the artistic skills of poetry has reached a handy level of proficiency, and he treats artistic norms with the spirit of renovation and surprise, and he is as happy as he wants. Moreover, the expressive power of Su Shi's poems is amazing, and there are almost no themes that can't be included in Su Shi's poems.

Su Shi is undoubtedly the greatest poet in the Northern Song Dynasty. Su Shi's poems are outstanding in the dimensions of wide subject matter, diverse forms and profound emotional connotation. More importantly, Su Shi has a strong artistic compatibility, and he does not push a certain style to the position of being a statue in theory and creation.

Although Su Shi has made great contributions in the process of creating a new look of Song poetry, he has basically avoided the two main shortcomings of Song poetry: sharp, new and blunt, and boring. Therefore, Su Shi surpassed his contemporaries in overall achievement and became the most popular poet in Song Dynasty.