1. "If you don't know what you don't know, you don't know what you are."

I am not afraid that others will not understand me, but I am afraid that I will not understand others.

When people know that you are secondary,

The key is whether you can distinguish others.

2. "See the sage Si Qi, see the sage and introspect."

When you see a virtuous person, you should look up to him. When you see a person without virtue, you should reflect on your own shortcomings.

English translation: keep pace with kind people,

Face your shortcomings and lack of virtue