《宋史·列传·卷二百一十八》
地的功能之所以说元亨利贞，就像立地的是阴柔与阳刚之类。
地之所谓元亨利贞者，如立地之道，柔与刚之类也。
The reason why the function of earth is to say yuanhenglizhen is like the principle of establishing the earth, which belongs to femininity and masculinity.