The original sentence is from the Book of Rites, Xueji by Dai Sheng in the Western Han Dynasty.
Original text:
A gentleman knows both teaching and being taught, and then he can be a teacher.
Therefore, the teaching of a gentleman is also. Tao leads, strong and restrained, open and far-reaching. Tao leads to harmony, strength leads to restraint and opening leads to thinking. Harmony with Louise is a good metaphor.
Vernacular translation:
A person who is determined to engage in education can be competent as a teacher if he understands both the successful experience of education and the reasons for its failure. Therefore, the teacher's teaching is to make students understand the truth. Guiding but not forcing, exhorting makes students strengthen their willpower without strict discipline, and appropriately enlightening without telling the whole story.
Guiding without bullying will make the relationship between teachers and students harmonious, encouraging without strict discipline will make students feel that learning is a relaxed and pleasant thing, and properly inspiring without covering everything will make students think hard. If the relationship between teachers and students can be harmonious, students can study easily and happily, and they can think hard, so that teachers can be called teachers who are good at teaching and educating people.