THE FOX AND THE FROG

There was a frog who claimed to be trained in the physician's art, acquainted with all the medicinal plants of the earth, the only creature who could cure the animals' ailments.

One day, the frog shouted loudly to all the animals,"I am a doctor; I can cure you of your illnesses."

The fox listened to the frog's announcement and exposed his lies by the colour of his skin. 'How can it be,' said the fox, 'that you are able to cure others of their illnesses, but you can't even cure yourself of your legs which are different in length, how can you help other animals?" 


Morals


Boastful claims end up exposing themselves. 

or 

Actions speak louder than words. One should always practise what one preaches.