The Bald Man and the Fly_英语寓言故事

there was once a bald man who sat down after work on a hot
summer's day.
a fly came up and kept buzzing about his bald pate,
and stinging him from time to time.
the man aimed a blow at his
little enemy, but acks palm came on his head instead;
again the fly tormented him, but this time the man was wiser and
said:

"you will only injure yourself if you
take notice of despicable enemies."