五行是中國古代的物質觀，分別為木、火、土、金、水，這五種元素充盈在天地之間，無所不在。五行也是四季自然律動的元素，彼此相互作用、相互發展，使自然產生變化，人遵循四時之法成，隨著春生，夏長，秋收，冬藏的規律而成長，違反自然便容易產生疾病。
Chinese
classify all the materials into the five elements, including wood, fire, earth,
metal, and water. The world we live in teems with these five ubiquitous
elements. The five elements interact with one another, which lead to changes
naturally, and thus we have four seasons. Human-beings should abide by the
rhythms of the four seasons, sowing in spring, growing in summer, harvesting in
fall, and storing in winter. If not, the violation of natural rhythms of rules
can give rise to disorders of all sorts.
