There is an old man and an old woman. They have a goose. It is a very special goose. Every day it has a golden egg. They sell the eggs for a lot of money. But the more money they have. the more they want. They think, "Our goose has golden eggs. It must be made of gold. Let us cut it open and get out all the gold. Then we will have more money."
So they kill the goose but find no gold. When they cut their goose open, they see that it is just like any other geese.
After that there are no more golden eggs, so they do not get any more money.
In the end they have nothing.