What is Smith's moral?

Smith's moral is: bullies can be arrogant for a while, but in the end they will not come to a good end.

This story tells us that cunning and treacherous people always like to brag and lie and live by cheating. Although such people "bravado" for a while by external force, they are very fragile in nature. On the other hand, it also inspires people to use their brains in everything, not to believe blindly, and not to be deceived by appearances. You can't bully others with their strength.

It means that the fox disguised himself as a tiger under the guise of his own strength. Metaphor relies on the strength of others to bully others.