There are four mental types

among human beings.

The man who knows,

and is aware that he knows:

he is wise, so inquire of him.

The man who knows,

but is unaware that he knows:

remind him and help him that he forget not.

The man who is ignorant,

and knows that he is ignorant : teach him.

The man who is ignorant,

but pretends to know:

he is fool, so keep away from him.

人有四种思维：

有学识之人，并能认识到自己是有学问的：

他是明智的，向这种人请教吧；

有学识但却意识不到自己有学识：

提醒并帮助他，让他不忘记。

无知之人，但有自知之明：帮他一把吧。

愚昧之人，但却不懂装懂：那是一个笨蛋，离他远点。