What are lessons learned in The Scarlet Ibis by James Hurst?

You can use the last sentence where it says something him holding his own Scarlet Ibis, I don't remember it exactly.

And the lesson could be something practical like "Be careful what you wish for." since the brother always disliked Doodle and wanted him to be gone.

Just reread and see what jumps out at you. It isn't that long of a story. So sad, I cried when doodle died.