There was a boy with a bad temper. His father gave him a bag of nails and told him to drive a nail into the backyard whenever he lost his temper. on the fence.
The boy had driven 37 nails in the first day. Slowly, the number of nails hammered by the boy decreased every day, and he found that it was easier to control his temper than to hammer those nails. Then, one day, the boy felt that he would never lose his temper again.
He told his father about it. The father also said that from now on, whenever he can control his temper, he will pull out a nail. Passed day by day, at last the boy told his father, he pulled out finally all nails.
The father took him by the hand and came out to the back yard and said, "You're doing well, my good boy! But look at the holes in those fences, these fences will never be restored to what they were before
The things you say when you're 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.