Is there a idiom in the story flying trunk by Hans christian andersen?

There is no specific idiom that is commonly cited as being from Hans Christian Andersen's story "The Flying Trunk." However, the story itself does convey some common idioms and themes that are widely understood.

Here are a few examples:

* "Too much of a good thing": The story emphasizes how even something initially desired, like the trunk, can become a burden and cause trouble when taken to an extreme.

* "The grass is always greener on the other side": The boy constantly seeks new lands and experiences, thinking they will bring him happiness, but ultimately realizes that happiness comes from within.

* "Curiosity killed the cat": The boy's relentless curiosity leads him into various dangerous situations.

* "Honesty is the best policy": The boy learns the importance of being truthful and the consequences of lying.

While these themes and concepts are present in the story, there's no single, definitive idiom specifically attributed to "The Flying Trunk."