Parable about nails

Once there was one very quick-tempered and unrestrained young man. Then one day his father gave him a bag of nails and punished, whenever he did not contain his anger, to drive one nail into the fence post.

On the first day there were several dozen nails in the post. On another week, he learned to restrain his anger, and every day the number of nails hammered into the pole began to decrease. The young man realized that it was easier to control his temperament than to drive nails.

Finally, the day came when he never lost his temper. He told this to his father, and he said that this time every day, when his son manages to restrain himself, he can pull a nail out of the pole.

Time passed, and the day came when he could tell his father that not a single nail was left in the pole. Then the father took his son by the hand and led him to the fence:
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“You did a good job, but do you see how many holes there are in a pole?” He will never be the same. When you say something evil to a person, he has the same scar as these holes. And no matter how many times you apologize after that, the scar will remain.