The so-called "Zhuangzi Nine Signs" refers to which nine aspects should we pay attention to when making friends?

Look at his loyalty from a distance-send him to a distant post to observe his loyalty;

Keep him close to him and respect him-let him serve him and respect him;

Be angry with him and observe his ability-send him to do complicated things and observe his ability;

See what you know when you ask-suddenly ask him questions to see if he is witty;

Look at its credibility in a hurry-set a meeting time in a hurry to see its credibility;

Entrust wealth to see its benevolence-entrust a lot of money to observe whether it is a gentleman with benevolence;

Tell him to watch the festival with danger-tell him that the situation is critical and observe his moral integrity;

Drunk, borrow wine to see the truth-deliberately drunk, see his true nature;

Look at its color by its position-look at its attitude towards people.