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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.

~
Nothing Gold Can Stay, a poem by the American poet Robert Frost (1874-1963), written in 1923. Probably one of the best poems ever written.