In ancient times, there was a story about a young man who was very good at archery and could accurately shoot through a leaf from a hundred paces away. He is very proud and shows off everywhere. It happened to be seen by an old man selling oil. He showed his unique skills in front of young people. He put a copper coin above the oil drum, scooped up a ladle of oil and skillfully poured it into the money hole, but there was no drop of oil on the copper coin. In fact, the old man's performance is to warn young people that with more practice, practice makes perfect, and they can't be satisfied with the status quo and don't strive for progress. They think that Laozi is the best in the world. Outside the castle peak building, the strong are always strong, and there is no end to learning and struggle. We should stick it out to the end.