A minister had a son who was dull-witted. He sent him to a scholar, saying, "Educate him and perhaps he will become wise." The scholar instructed him for a while, but it had no effect. The scholar sent a message to the father, saying, "This boy will not become wise, and he has driven me to madness."
When a person’s nature is good,
Training will have an effect on them.
No amount of polishing can make good
The iron that is of bad essence.
Wash a dog in the seven seas,
When it is wet, it becomes filthier.
If the donkey of Jesus were taken to Mecca,
It would still return as a donkey.