The Earth Element
“Earth occupies the center and is called the heavenly fructifier. It is the assister of Heaven. Its power is abundant and good, and cannot be assigned to the affairs of a single season only. Therefore among the five Elements and four Seasons, Earth embraces all. Although Metal, Wood, Water and Fire each have their own particular duties, they could not stand were it not for Earth.”
-Tung Chung-Shu, Philosopher 2nd Century B.C.E.