Why did Confucius "let Luz try the water"? Is it necessary for Confucius to do this? Talk about your opinion and explain the reasons in combination with the content of the paragraph.

It is necessary for Confucius to do this, because Confucius wants his eldest son to understand that being a man cannot be complacent.

There are many records about Luz in history, and Sima Qian also spent a lot of ink on Luz in Historical Records. Confucius was very familiar with Luz and knew his personality characteristics very well.

Therefore, Confucius predicted very early that Lutz would not come to a good end. It turns out that this inference is very accurate. Now we say that personality determines fate, and Lutz's personality may have determined his fate in that troubled times.

Extended data:

Lutz is very generous. Confucius once asked Luz about his ambition. Luz said, I want to enjoy my good car and clothes with my good friends, even if it is broken. From here, we can see that Luz likes to make friends. Of course, this is Lutz's ambition, which means that it has not yet been realized. But you can see Lutz's character from here.

Luz was brave, and Confucius knew Luz very well, so Confucius said, "You are braver than me." I think Confucius must be a brave man, but Confucius rated Luz as more brave than himself, so Luz must be a very brave man.