Proverbs 21:11

The man who insults might not learn from his punishment. But other people can learn. Simple people have not learned to be wise. So simple people do evil things. But the simple people will see the punishment of the man who insults. So the simple people will be able to learn from that man’s error.

A wise man does not need a punishment. He will learn his lessons. Teach him, and he will become even wiser.