Don't just look at one person, what you see is only the appearance.

"People can't judge by appearances, and the sea water can't be measured."

The extended meaning is:

"You can't judge (someone) by his appearance, nor can you measure the amount of water in the sea by a bucket", that is, you can't judge people by their appearance, and you can't infer the connotation by their appearance.

Judging people by their appearances is a common problem for many people. Stupid people only judge people by their appearances, and smart people can see the potential hidden under their appearances.

Don't just look at a person. You only see his appearance. That's right. To see a person clearly, we should slowly feel his heart from contact. No matter what he says, there are many people who are good at camouflage. Even if you have contact with him and want to know his behavior habits, it will take a little longer to see the door.

It is suggested that if you really want to get to know a person seriously, you should spend more time with him, study his behavior and habits slowly, and don't jump to conclusions, so as not to make bad friends, and you will regret it.