1. Stones from other mountains can be used to attack jade

2. After three days of separation, we saw each other with admiration.

3． Never forgetting the past is the guide for the future

4. If a person has no long-term worries, he must have immediate worries

5. If a worker wants to do his job well, he must first sharpen his tools

6. When the water is clear, there are no fish; when people observe it, there are no disciples