Precious things are without value to those who cannot prize them.

A Cock was busily scratching and scraping about to find
something to eat for himself and his family, when he happened
to turn up a precious jewel that had been lost by its owner.

"Aha!" said the Cock. "No doubt you are very costly and he who
lost you would give a great deal to find you. But as for me, I
would choose a single grain of barleycorn before all the jewels
in the world."