One summer afternoon, a businessman with his son heard someone knocking on their front door. The man immediately darted his looks to his son and made a sign to let him open the door. His obedient son made his way to the door and opened it halfway. An old man burst upon him with his dirty looks and hungry face and smiled as soon as he sighted the young boy.

"How may I help you?" asked the boy.

"I came from a remote valley. I had to flee to find a better home but I am so thirsty and can't continue walking. If you are kind enough can you offer me a glass of water?" the old man replied almost pleading.

The young boy sympathized with him so he gave the old man a glass of water. He thanked the young...