Therefore, a gentleman watches his loyalty when he is at a distance; he watches his respect when he is close; he watches his ability when he is troubled; he watches his knowledge when he asks if he is in a hurry; he watches his trust when he is in a hurry. Entrust it with wealth and observe its benevolence, tell it with danger and observe its integrity, drunken it with wine and observe its side, mix it with its place and observe its color.

——"Zhuangzi: Li Yukou"

People who work with you must not fail to scrutinize them.

——"Han Feizi·Shuo Lin Shang"

If you are good, you will know its evil; if you are evil, you will know its beauty.

——"Book of Rites·University"

One life and one death are friendships; one poor and one rich are friendships; one noble and one lowly are friendships.

——"Historical Records·Ji Zheng's Biography and Praise"

The horse is used as a companion, and the advisor is used as a residence.

——[Three Kingdoms and Wei] Wang Su's "Confucius' Family Sayings·Zai'e"

There are seven ways to know people: the first is to observe their aspirations based on right and wrong; the second is to The third is to counsel the poor and observe their changes through eloquence; the third is to counsel them on strategies and observe their knowledge; the fourth is to tell them about disasters and difficulties and observe their courage; the fifth is to be drunk and observe their nature with wine; the sixth is to approach them to benefit. And observe his integrity; Qi said that he should observe his trustworthiness by doing things.

——[Three Kingdoms of Shu] Zhuge Liang's "Jiangyuan·Knowing Human Nature"