Nails on the fence.

Once upon a time, there was a boy with a bad temper. His father gave him a bag of nails and told him that every time he lost his temper or quarreled with someone else, he put a nail in the fence of the courtyard. On the first day, the boy nailed 37 nails.

In the following days, he slowly learned to control his temper, and the nails he nailed each day gradually decreased. He found that it was actually easier to control your temper than to drive a nail. One day, without a nail, he happily told his father. From now on, if you don't lose your temper all day, you can pull a nail out of the fence. The days passed by, and all the nails in the fence were pulled out. The father took him to the fence and said, "You are doing well, son, but look at the nail hole in the fence. The hole will never be the same again.
It's like when you argue with someone and say something nasty, you leave a wound in his heart, like this nail hole. "A knife was inserted into a person's body. After it was pulled out, the wound was difficult to heal. No matter how sorry you are, there's always a wound. Understand that physical wounds are as difficult to recover as mental wounds.
Afterword:
Your friends and your family are a valuable asset to you. They make you more confident.