Once there was a 8 years old little boy by the name of Howard who went door to door to sell things to earn money for his education.
One day when he was walking from door to door, he felt very hungry but only left 10 cents in his pocket. So he decided to pray for his daily bread before moving on to the next house. Yet, the bread never come and soon, he was so hungry that he fainted.
Luckily, a woman walked past and saw this fainted boy there. She was also very poor but she waked him up and give him a glass of milk. He took the glass of milk and started drinking it.
When Howard finish the milk, he asked the lady how much he owe her. The lady told him that he owe her nothing as one should not think of getting rewards when doing good deeds. Howard thank the lady and left the lady's house. When Howard left, he felt that the faith in him that he once had in him was nearly gone and he doubt if there was really a God.
20 years later, this very same lady contracted a deadly virus and all doctors from that town couldn't save her. She was send to the biggest city in the country to be treat by a top specialist there.
I think you have guessed it. That top specialist IS that very same boy whom the lady gave the milk to, now called Dr Howard.
The lady did not recognise Howard (who has grown up) but Howard recognise the lady immediately. He did not disclose his identity but he vow to try his best to save that lady. In the end, he succeeded and the lady was cured.
After the operation, Howard ask the nurse to bring the lady's bill to his office. He paid for the lady and wrote an invoice to the lady. When the lady received the invoice, she was damn worried that she will have to work the rest of her life to pay the expensive treatment bill. But when she saw the invoice, these words are written on it.
"You have paid the bill in full with a glass of milk. Your glass of milk had brought me to where I am now. Instead of praying hard for good results, I rely just on my hard work and perseverance to become a top specialist today. Thank you."
The lady then realised that Dr Howard IS that little boy she once gave a glass of milk and she was glad that she had free the young boy from intellectual bondage and indirectly changed her destiny as well.