There are the following famous sayings about thanking teachers for their hard work:

1. A teacher for a day is a father for a lifetime. This sentence comes from "The Lost Book of Taigong's Tutoring in Mingsha Shishi".

2. Learning is more important than respecting your teacher. This sentence comes from Tan Sitong's "Additional Regulations of Liuyang Mathematical Academy".

3. A gentleman looks after his teachers and relatives. This sentence comes from "Xunzi Self-cultivation".

4. The key to learning is to respect the teacher. This sentence comes from "Lu Shi Chun Qiu Encouraging Learning".

5. Serving as a teacher is like serving as a father. This sentence comes from "Lu Shi Chun Qiu Encouraging Learning".

6. Respecting a teacher does not matter whether he is high or low, rich or poor. This sentence comes from "Lu Shi Chun Qiu Encouraging Learning".

7. The kindness of the Master is greater than heaven and earth, and is more important than parents. This sentence comes from Ge Hong's "Qinqiu".

8. When a country is about to prosper, it is important to cherish the teacher. This sentence comes from "Xunzi's Brief Introduction".

9. The foundation of goodness lies in teaching, the foundation of teaching lies in the teacher, and he must be respected. This sentence comes from Li Gou's "Guang Qian Shu".

10. Respect the teachings of teachers and have a good learning style. This sentence comes from Kang Youwei's "Speeches on Political Commentaries in Zhejiang".