A long time ago there lived a very rich and powerful king.All the people in his country were afraid of him.But was he happy？No，he was always ill and unhappy.His money and his power（权力）could not help him.Hie doctors in his country could not help him either.
One day two famous doctors from another country came to see him.
"If you can cure me and make me happy，"said the king，"I will give you half of my gold."
The first doctor examined him.He found nothing wrong
"Oh，King，you are a very healthy man，"said the doctor."You only think you are ill and that makes you unhappy.
The king was very angry when he heard this.He told his soldiers to cut off the doctor's head.
The second doctor knew he had to be care-ful."Oh，King，you will be well if you find a happy man and wear his shoes，"he said.Ther king asked hundreds of people if they were happy and they all said they were sometimes happy and sometimes sad.
One day, they found a poor man who was almost always happy. When they asked for his shoes, however, he had only one worn shoe.
Some time later, the king met a beggar with a full smile who said that he was always happy.
"Give me your shoes quickly,"said the king, "And I will make you a very rich man."
"HaHa…."The beggar laughed. "I'm sorry."he answered. "I've never had any shoe! "