The eagle sees Peng die and believes in nature. How to explain it?

"The eagle looks at Peng, and naturally believes", which comes from Li Si's "Round brushwork" in Qin Dynasty, is a skill in calligraphy. On the use of pen: "The way a husband uses a pen is to be anxious first and then return to illness;" If the eagle dies at Peng, believe in nature and cannot be changed. If you are full, you will get water if you swim; Dancing pens are like mountains and clouds. Or roll or relax, light and heavy, if you think about it, think about it. " "Eagle looks at Peng and believes in nature" means that when writing, the pen should be as powerful as the flying movements of eagle and Dapeng bird, and it should be swept away, confident, smooth and natural, otherwise it will appear feminine and artificial. In calligraphy writing, sending a pen is a process that goes against the trend, that is, first make a point in the opposite direction of writing, and then turn it upside down to make the pen flat on the paper, so as to achieve the purpose of using the pen in the center. Because the nib of the whole writing process is hidden in the painting when it is reversed, there is no trace of the beginning and the end, so it can give people a round feeling. When you make this kind of hairbrush, you must use it naturally. The reverse movement should be fast, but not slow. If you are slow, you will have no motivation, and if you don't have motivation, you will be weak.