treat all alike
In a school, those with good grades and those with poor grades should be treated equally. This heart is right and cultivated, and students can learn virtue.
Mentality decides everything
If the teacher gets good grades and ignores the poor ones, then all the students are wrong. If you get good grades, you will be arrogant; if you get poor grades, you will feel inferior or resentful, and you will disagree with your teacher. A person will be anti-parents, anti-teachers, and later anti-society. Therefore, teachers' accomplishment directly affects students' mentality.