The poet addresses Margaret, a young child, who grieves over the falling of leaves at Goldengrove and the turning of seasons. She may not now be able to understand or name the source of her grief. When she gets older, though, and learns more of the world ("such sights colder / By and by . . . "), she will become less sensitive to external things and more aware of the true loss in human life--the loss of oneself. "It is the blight man was born for, / It is Margaret you mourn for."