Lincoln: Dig Holes

In the eighteen century, when American Lincoln President was a young man, showed his wisdom in his house affairs.
At that time, his father bought a house with a big garden, but the garden, was full of big stones, unable to play on garden.
This garden was of no use to them. They could not play in the garden, but all the time staying at house.
His father, early morning to work, late night home, seldom came to see the garden.
One day his father saw the garden but the stones disappeared. He was surprised and asked Lincoln the reason.
Lincoln answered, it was he when he had time, he digged the ground to a hole and pushed the stone to the hole.
By few months time, all the stones were under ground. The garden now could be for playing or of anything else.