Free adaptation of a tale

One day a young man in his thirties came to his Rabbi and told him that he was decided to leave everything and try to change the world. He was bored of looking how terrible other people were!
The Rabbi told him that the world was too big to be changed by one person and recommended him to start with his country.
After a couple of days he came back to the Rabbi and told him that he couldn't get nobody to listen to him and that he was even more deceptioned by humans. The Rabbi told him that maybe the task was to give and suggested him to start with his neighborhood. Before a week was passed he came back.
He complained about local politicians and even about there secretaries, so the Rabbi told him that he should start by his block.
After a week he was back really looking bad. Talked a lot about other people's evilness and told the Rabbi that he was losing hope. The Rabbi told him that may be it would be a good idea to start changing his building, creating a new relation between neighbors.
Two days after the man came back, cursing all his neighbors. So the Rabbi asked him what about his own house, his wife, his children. Next day the Rabbi received a call from the man asking him to receive him, since it was night he told him to come to his house.
When the man arrived he said that his wife didn't pay attention to him and asked him to take out the garbage, his children were more interested in playing and he just caught their attention turning off the TV, what started a brawl.
So the Rabbi told him:
"You wanted to change the world and I told you to start with your country, then we went down to your town, to your neighborhood and to your block, you saw it was impossible. You tried with your building and you got the same impression, that everybody was bad.
So I asked you to try with your family, and now you come talking about your wife and children. Did you ever think about changing yourself? About looking inside your one and how you treat your wife and your children?"
The man was surprised and angry, but after a walk home he started to think about it.
After a month he came back to the Rabbi and told him:
"You taught me a big lesson! My life is much better now! I don't fight with my wife, I've found time to play with my children and we are all much happier"
So the Rabbi asked him: "What about changing the world?"
"I believe that the lesson was that if each one of us gets busy trying to be a better person, finally all the world will change!"