It is thought that early Buddhism was included in this textbook because it is the root of Buddhism, and Zhongguan Thought and Mind-only Thought were included in this textbook because it is the center of Mahayana Buddhism.
초기불교는 불교의 뿌리이기 때문에 본 교과서에 포함되었고, 중관 사상과 유식사상은 대승불교의 중심이기 때문에 본 교과서에 포함되었다고 생각된다.