2. A knowledgeable person doesn't practice, which means a bee doesn't make honey. -ancient Persia Saadi
3. Theory is the eye of practice. -Zou Taofen (middle)
4. Whether people's thinking has objective truth is not a theoretical problem, but a practical one. -Marx (Germany)
5. I have a shallow understanding of what I got on paper, and I don't know how to do it. -Lu You (Song)
6. Don't worry about making mistakes. The biggest mistake is that you have no practical experience. -France-Wovenago
7. Practice will solve the difficult problems that theory cannot solve. -de Feuerbach
8. A gentleman is ashamed of his words but not his deeds. -Zisi
9. Doing is the beginning of knowing, and knowing is the success of doing. -Tao Xingzhi