Sharp tools make good work. In other words, if a craftsman wants to do a good job, he must first grind his tools. It is very important to prepare for a good job. The Analects of Confucius, Wei Linggong: Zi Gong Qiu Ren. Confucius said, "If a worker wants to do a good job, he must sharpen his tools first. Living in a country is also a saint and a doctor, and a benevolent person is a friend of the people. "