In fact, we can analyze that rich soil can't be used and fire can't be used, leaving "wood, water and gold". Wood, wood, soil, and soil are weakened. Water, earth, water and earth are gas-consuming. Use gold, natural gold, to be discouraged. Gold is the best of the three. Gold can release some strong gas in the soil, while gold can generate water, water can regenerate wood, wood can make a fire, and the five elements will reach a basic balance. Therefore, "water" is not as good as using God.