Once upon a time, there was a boy with a bad character. So his father gave him a sack of nails and asked him to hammer in one each time he loses his patience and argues with someone or offends someone.
On the first day, the boy hammered 35 nails into the fence. In the weeks that followed, he learned to control himself, and the number of nails he hammered diminished day by day. He found it easier to control himself than hammering nails.
The day finally came when the boy went to his father and told him that he had not hammered a nail that day.
The father was overjoyed, congratulated him, and ordered him to take one nail out of the fence every day when he had the composure and would not argue or offend someone.