From A Chinese Garden of Serenity (1959), by Hung Tzu-ch’eng, translated by Chao Tze-chiang:

When the wind blows through the scattered bamboos, they do not hold its sound after it has gone. When the wild geese fly over a cold lake, it does not retain their shadows after they have passed. So the mind of the superior man begins to work only when an event occurs; and it becomes a void again when the matter ends.