(Note: This story I got from an English language test. Simple, yet meaningful.)
The Greedy Doctor
A famous doctor had cured a child of a very serious illness. The mother was
grateful and went to the doctor's office to thank him.
"Doctor," she said, "there are some things we can't pay for, I thought that you
would want to accept this wallet which I made for you with my own hands."
"Madam," answered the doctor rudely, "I don't practice medicine for sentimental
reasons. You must pay me with money. Your bill is $ 2,000.
The lady opened the wallet, took out the $ 5,000 she had put in it,
and gave the greedy doctor $ 2,000.