Do good and good will come to you

An unemployed graduate who has searched for work but couldn't find one, woke up one morning and checked his pocket. All he had left was $10. He decided to use it to buy food and wait for the punishment of hunger, since he was too proud to beg.
He was so frustrated not to find a job and had no one available to help him.
He bought his food and as soon as he sat down to eat, an old man and two small children approached him and asked him to give them food, since they had not eaten in almost a week.
The graduate looked at them. They were so skinny that they could feel their bones. His eyes had sunk. With the last piece of compassion left to him, he gave them his food.
The old man and the children prayed that God would give him blessings and prosperity, and gave him a very old coin. The young graduate said, "You need that prayer more than I do."
You know, a man can survive without food for 4 weeks, without water for 4 days, without air for 4 minutes but can not survive 4 seconds without HOPE.....
Without money, without work and without food but with hope, the young man went under a bridge to rest.
He was about to fall asleep, guess what? A miracle happened.
He saw an old newspaper on the floor. He picked it up, and suddenly read an advertisement for those who had old coins, they would take them in a certain direction...
He decided to go to that place with the old coin that the old man gave him. When he arrived at the company, he gave the coin to the manager of the company. The manager shouted, as if he has seen a ghost then he pulled out a large book and showed the young graduate a photo.
It was the same coin, whose value was 3 million dollars. The young graduate was very excited while the owner gave him a bank card for the 3 million. The young man collected the money and went in search of the old man and the children.
By the time he got to where he left them eating, they were gone. He asked the owner of a nearby canteen if he knew them. The owner told him that he did not know them, but that they had left him a note. He quickly opened the note thinking he would find out where to find them.
This was what the note said: " Do good and good will come to you*
The End
So, what lessons did u learn from this?