What did the ancient scholars call them?

What did ancient scholars call "Sir" or "Master"? In ancient times, many schools were run by private or government officials, and the responsibility of teachers was to help students learn knowledge. These teachers were called "Sir" or "Master" because they were thought to be the ones who taught the students. This title originated from ancient Chinese Confucianism, which believed that everyone had a "teacher"(that is, a mentor or teacher) who could help them learn moral and ethical knowledge. Therefore,"Sir" or "Master" became the honorific title of the education workers.