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.
Everything That Comes Must Also Go 
 
 
 Whether leaves, or sunrises, dreams, even material wealth, everything will fade with time.  People will go through ups and downs, through life and death. 
 Gold – beauty, hope, miracles – can exist, but as they come, they must also go.
Nothing Gold Can Stay