To be honest, this is like the first poem I've ever read (excluding the ones in Literature in school). I discovered it from a movie from the 80s called The Outsiders, which was based on a novel of the same name. Basically, this poem explains about how something so pure, so innocent and untouched can only stay that way for so long. Anyway, here it is, the poem by Robert Frost.

Nature's first green is gold
Her hardest hue to hold.
Her early leaf's a flower;
But only so an hour.
Then leaf subsides to leaf.
So Eden sank to grief,
So dawn goes down to day.
Nothing gold can stay.