The poem "Nothing Gold Can Stay" by Robert Frost explores the fleeting nature of beauty and the inevitability of change. The "first green" symbolizes youth and the initial beauty of life, which quickly fades away, much like the early leaves that bloom briefly before succumbing to the cycle of nature. The imagery of Eden suggests a loss of innocence and the transition from paradise to sorrow. Ultimately, the poem conveys the poignant truth that all beautiful moments are temporary and must eventually give way to the realities of life.