I have a bad temper. One day, my girlfriend gave me a bag of nails. She told me to hammer a nail into the fence in the backyard every time I lost my temper. On the first day, I hammered 37 nails. Gradually, the number of nails I hammered in each day decreased. I found that it was easier to control my temper than to hammer in those nails. So, one day, I never lost my patience and lost my temper again. I told my girlfriend about this. She also said that from now on, every time I could control my temper, I would pull out a nail. Days passed, and finally I told her that I had finally pulled out all the nails.

After hearing this, my girlfriend hugged my hand, came to the backyard and said, "You did a good job, my good man, but look at the holes in the fence. These fences will never be restored to their original state. The words you say when you are angry leave scars like these nails. If you stab someone with a knife, no matter how many times you say sorry, the wound will always be there. The pain of words is as unbearable as real pain."