Yi Qiu is one of the best players in the country. Let Qiu teach two people to play, one of them concentrates on it, but Yi Qiu listens; although the other listens, he thinks that there is a swan coming, and wants to help him with his bow and shoot it. Even though I have learned from him, I am not as good as him. Why is he so wise? Said: Not so.

——Selected from "Mencius·Gaozi"

This is the original text of Xue Yi, which can help you understand the famous sayings of concentration and not half-heartedness