Chengmen Lixue: There was a man named Yang Shi in the Song Dynasty who was a student of the Neo-Confucian Cheng Yi. When he was in his 40s, he went to Luoyang to meet Cheng Yi. When he and another classmate came When Cheng Yi was staying at home, it snowed heavily. Cheng Yi was taking a nap. They stood outside the door and waited quietly until Cheng Yi woke up. By then, the snow had fallen more than a foot deep. This is the "Cheng Men Li" that has been passed down to this day. Snow" story

There is also a saying that "teachers are like candles that burn themselves and illuminate others."