What does it mean to read and blow duckweed in the sage's study?

The sage's study turns over books, and the wind blows duckweed. It describes the young people who have just stepped into the society and are not deeply involved in the world, just like a duckweed wandering in the rivers and lakes, with a fragile and vacant future. With a goodwill, even if we are traveling far and wide now, there is always a chance to meet again after meeting.