People who don't understand Buddhism will blurt out to you: "Without debauchery and wealth, everything is empty!" " In fact, this has nothing to do with what Buddhists say. It's just a bull's head without a horse's mouth. Because the four things mentioned in Buddhism refer to the four material factors of "earth, water, fire and wind". These four concepts were not invented by Buddhism, but the result of human's initial exploration of the universe itself. There is almost the same trend in the history of philosophical thought between the East and the West. For example, the five elements of "water, fire, gold, wood and earth" recorded in China's Book of Songs; The formation of the world mentioned in this episode of India's ancient Vedas is based on five natural factors: land, water, wind, fire and air. Empedocles, an ancient Greek philosopher, also proposed that "air, water, earth and fire" are the four unchanging elements in the universe. In short, no matter the five elements, the five big ones and the four big ones, they all refer to the basic elements of the material world. If we confine ourselves to this and stick to it, the result of development will be materialism. Therefore, these thoughts are also the pioneers of materialism. Buddhism says that everything is empty, which is deepened and Buddhistized according to the inherent concept of India, because the four elements of earth, water, fire and wind are cosmic physics. For example, mountains belong to a large area of land, oceans and rivers belong to a large area of water, hot sunlight belongs to a large area of fire, and space airflow belongs to a large area of wind. If we turn them into human physiology, such as hair and flesh, blood secretion belongs to water, body temperature belongs to fire, and breathing belongs to wind; From the four physical properties, hardness belongs to big, wet belongs to big water, temperature belongs to big fire, and flow belongs to strong wind.