Once there was a boy who often lost his temper. His father gave him a bag of nails and told him: every time you can't refrain from getting angry or want to fight , hammer a nail in the wall.
The first day, the boy nailed 37 nails, he was simply tired to death. A few days later he learned to control his temper, he hammered less and less nails each day. He found out that it's much easier not to get angry than hammer a nail. A month later, one day he did not hammer a single nail, he was pleased to tell his father. The father said: "From now on, if you do not get angry a day, one can pull out a nail from the wall. " Day after day and finally all nails were plucked out. The father said: "You have done well, but there will always be holes in the wall.
Like you fight with someone, that person will have a heart hole, no matter how much you apologize, the wound is always there.