there was a dog running cross the bridge with a piece of meat in his mouth. Whie the was on the bridge, he looked down and saw another dog with alrger piece of meat. He immediately let go of his own, and fiercely barked and attacked another dog to get that larger piece. But as he opened his mouth, his own meat was dropped into the water. So he lost both, but it was too late for him to realize that what he saw was his own shadow reflected in ther water.
Moral of ther story: Beware lest you lose the substance by grasping at the shadow