envy not your neighbour

Once there was a cow, she often watched with great envy how her owner’s neighbor fed his cow with choicest delicacies, while her menu was almost always fixed- a little hay, a little grass and a little other things! She hated her master for being so mean so stringent.

Then one day she saw her owner’s neighbor slaughtering his cow to eat her. She never grumbled about her menu again.