Cultivate yourself and make friends.

The president of Tsinghua University encouraged more than 3,000 undergraduate freshmen: be careful when you are alone, and you will never be alone. It means: Those who are strict with themselves will not feel lonely; if they move forward with like-minded people, they will be able to achieve long-term success.

Shen Du: It means that when you are living alone without supervision, you must be more cautious and consciously abide by various moral principles;

Shen Du, the word first came from "The Book of Rites·The Doctrine of the Mean" , original text: "The Tao cannot be separated for a moment, but it is not the Tao. Therefore, a gentleman is wary of what he does not see, and is afraid of what he does not hear. Do not see what is hidden, and do not reveal what is insignificant. Therefore, a gentleman is careful of what he does not see. Alone. ”