The weak element is above, the strong below; hence their powers attract each other, so that they unite. This brings about success, for all success depends on the effect of mutual attraction. By keeping still within while experiencing joy without, one can prevent the joy from going to excess and hold it within proper bounds. This is the meaning of the added admonition, "Perseverance furthers," for it is perseverance that makes the difference between seduction and courtship; in the latter the strong man takes a position inferior to that of the weak girl and shows consideration for her. This attraction between affinities is a general law of nature. Heaven and earth attract each other and thus all creatures come into being. Through such attraction the sage influences men's hearts, and thus the world attains peace. From the attractions they exert we can learn the nature of all beings in heaven and on earth.