It means knowing that there are many unpleasant things in this world, but still living every day optimistically; Keep a good heart, not let yourself go astray in order to follow the crowd.

from guiguzi in the Spring and Autumn Period and the Warring States Period.

Original: Knowing the world makes you unsophisticated, and the calendar is smooth and naive.

translation: It is said that a person should know how to behave and be familiar with the world, but it will not make him crafty and worldly, but only know how to kiss up. Even though I have experienced a lot of sophistication, I still retain the innocence in my heart.

Extended information:

Knowing the world and being unsophisticated. Meaning:

If you want to know the truth of the world faster and better, you need to take the initiative, read thousands of books and take the Wan Li Road. This is difficult, but if you want to grow up, you need to pay. You should read a book that has a deep understanding of yourself at least once a year, and you can't just stay at home and go out for a walk.

To know how wonderful the outside world is, you can't just look at the scenery, but also learn about the local culture and the outside world, which makes you not limited to your current environment.

knowing the world makes you unsophisticated, and knowing the world is not influenced by it. The small is hidden in the mountains, and the big is hidden in the city. With this calm attitude of the hermit, we will build a back garden for ourselves in the secular world, and experience the infinite realm beyond the worldly world with a mentality beyond the worldly world.