Not meaning to take points but what are you talking to about.
While I do agree with that prompt, I think this is more of a thing that you would have to do because of what the prompt asked.
Answer:
That repetitive saying:<em><u> Don't judge a book by it's cover.</u></em>
The Lion underestimated the mouse because of his size. When the mouse promised he was going to repay the lion, he though he was full of it.
The lion was wrong about the mouse. Even though the mouse is small and the lion is big, doesn't mean the mouse cannot do anything to help the lion.
Size doesn't matter. It's how somebody helps you.