The Question and Answer section for Robert Frost: Poems is a great resource to ask questions, find answers, and discuss the novel.
The story, The Runnway?
I'm not sure what text are you referring to.
I think the theme has to do with lost innocence and the simple joy of being a child. I'm hesitant to apply morals to poetry but, if you must, you might consider "try to keep your sense of innocence."