An old farmer who was about to die called his two sons to his bedside and said, "My boys, my farm and the fields are yours in equal shares. I leave you a little ready money but the bulk of my wealth is hidden somewhere in the ground, not more than eighteen inches from the surface. I regret that I've forgotten precisely where it lies."
When the old man was dead and buried his two sons set to work to dig up every inch of ground in order to find the buried treasure. They failed to find it but as they'd gone to all the trouble of turning over the soil they thought they might as well sow a crop, which they did, reaping a good harvest.
In autumn as soon as they had an opportunity they dug for the treasure again but with no better results. As their fields were turned over more thoroughly than any others in the neighborhood they reaped better harvests than anyone else. Year after year their search continued.
Only when they had grown much older and wiser did they realize what their father had meant. Real treasure comes as a result of hard work.