Huang Lishuan explained

Shangguan should be the official above. This means that many officials from above and people from the past have to deal with each other.

Books are like mountains, and money is like the sea. Thin books may refer to paperwork, official documents and finance.

The above should mean that being an official is hard and tired. We not only have to deal with people above and around, but also deal with official business and finance every day.

People of his character don't want to mix officialdom.

There is another sentence behind: however, Shangguan keeps people away from a pair of cheap bones, passers-by only leave a smiling face, books keep people away from a strong spirit, and Qian Gu keeps people away from a cruel heart.

It means that an official can bear it, but he will suffer mentally. Not suitable for being an official.

Finally, I was depressed and sad, which led to this evil disease. If officials don't go, the disease won't heal.