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

If a man could make his body spirit and appear in the shadow of cloud and mist, he would begin to apprehend that the common clay is a shackle. And if he could hear the tender voice of his inner self in the chirping of birds, he would be able to perceive that passions are spears.