A Frog once upon a time came forth from his home in the marsh and proclaimed to all the beasts that he was a learned physician, skilled in the use of drugs and able to heal all diseases. A Fox asked him, “How can you pretend to prescribe for others, when you are unable to heal your own lame gait and wrinkled skin?”

Credits
Aesop was an ancient Greek storyteller, believed to have lived around the 6th century BCE, whose fables have been retold across cultures for over two millennia. His tales typically feature animals whose flaws and follies mirror human behaviour, and "The Quack Frog" is a sharp example of his recurring theme: that credibility must be earned, not proclaimed.
