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Nothing Gold Can Stay represents that nothing innocent can stay for long. For example, as Robert Frost states, some of the first things in nature are gold (like a sunrise). The gold eventually fades away from its beauty.
The poem Nothing Gold Can Stay by Robert Frost goes as follows: Natures 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...