What Is The Moral Lesson In Rumpelstiltskin?

I thought it was like "don't make promises you can't keep" or "don't lie"
...
Still not sure though...

I think the moral of Rumpelstiltskin is don't pretend you are something your not and if you do it will come at a price. Lucky for the Queen it all works out for her.

It probably has something to do with "Don't trick people" or "Do a favor just to be kind, and don't expect any rewards".