Bukko Dendo Kyokai:

There was a man who was apt to get angry easily. One day two men were talking in front of the house about the man who lived there. One said to the other: 'he is a nice man but is very impatient; he has a hot temper and gets angry quickly.' The man overheard the remark, rushed out of the house and attacked the two men, striking and kicking and wounding them.

When a wise man is advised of his errors, he will reflect on them and improve his conduct. When his misconduct is pointed out, a foolish man will not only disregard the advise but rather repeat the same error.