A LOVELY LITTLE STORY, ONE TO LIVE BY

I don't even know where I read it. If you do, please let me know! Here it is with some embellishments I can't avoid.

A father, on his deathbed, tells his son that he has buried a treasure near the roots of one of the apple trees in their apple orchard. He tells him, dig in a circle near the roots, but do not harm them. After his father's death, after an appropriate period of mourning, the son systematically began to dig around the many, many apple trees in their orchard; so many, in fact, that by the time he had hug around all of them, he was an old man. He found nothing, and after digging around the last tree, he went home, rather disappointed. He climbed the steps to his house -- by now a mansion instead of the shack he had lived in with his father -- to the upstairs story and sat down by a window, dejected and a bit angry at his father for putting him through all that labor for nothing.

He looked far into the distance and couldn't see the end of his land. The original apple trees had yielded  so abundantly that he had been able to buy more and more land to add to his own and plant more and more fruit trees. But looking at the original orchard, he saw that the trees were healthy, strong, and laden, as usual with their abundance. He realized in a flash what his father had meant: the trees were the treasure, and taking care of them by aerating the roots was the means to get it!