Once upon a time a dog met a piece of meat unexpectedly.
He gripped the meat in this mouth and went straight home to eat.
On his way home while he was crossing a bridge over a brook, he saw his own shadow reflected in the water beneath.
He misunderstood that it was another dog with another piece of meat double his own in size.
With cupidity he wanted that meat also, so barked at the dog in the water threateningly to get his larger piece.
But as he opened his mouth, the piece of meat fell out and dropped into the water.
He lost both of meat in the water and his own.
“If you grasp at the shadow you will lose the substance”