There is no contradiction. Each class should teach students in accordance with their aptitude, which is what Confucius said.

The so-called teaching without distinction means that Confucius will accept this student as long as he pays tuition (training), regardless of grade. In a certain sense, this is an impact on the hierarchical system that only nobles can enter schools, and it is a historical progress. In other words, no matter who can be educated, it is an educational attitude.

Teaching students in accordance with their aptitude is to give specific and different individual guidance according to their individual temperament, which makes it easier to cultivate students' personality. In ancient private school education, teaching students in accordance with their aptitude is the basic teaching guiding ideology. In modern school education, due to large-scale collective education, teaching students in accordance with their aptitude has become a difficult educational field and an educational method.

Teaching without distinction: it is an attitude, an attitude of choosing to be a student.

Teaching students in accordance with their aptitude: Is it a way or a method to make students learn better?