Practical meaning: in the face of making waves, watch its development and changes.
This poem is from Mao Zedong's Seven Laws and Thoughts.
The full text of this poem is: It was when God had something to do that he came to the south to step on the fragrant branches. Pine trees rage at the sky, and fallen leaves run with the clear water. A gust of wind and thunder shocked the world, with red and green streets and flags flying. Listening to the falling rain through the gap, people in the old country thought.