英语寓言故事-The Farmer and His Sons

A FATHER, being on the point of death, wished to be sure that his
sons would give the same attention to his farm as he himself had
given it.
He called them to his bedside and said, "My sons,
there is a great treasure hid in one of my vineyards."
The sons,
after his death, took their spades and mattocks and carefully dug
over every portion of their land.
They found no treasure, but
the vines repaid their labor by an extraordinary and
superabundant crop.