The first law of the universe is endless life. In this process, the biggest role of soil is not to breed everything, but to corrupt everything, which is equivalent to the human stomach. Its function is to make a living by destroying.
Among the five elements, soil can produce gold, and gold is the killing after harvest. A leaf goes from light yellow to turquoise, then to dark green, and finally withers to the root. This is called harvesting and killing, and it is the end of a natural cycle of growth and collection in nature.
The harvesting and killing on the earth are all done by the earth. A leaf falls into the soil to rot until it becomes the nutrition of other plants in the next year, and its life breath is integrated into another life.