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The theme identified is the fleeting nature of beauty and innocence. The two lines that best develop and support this theme are "Her early leaf's a flower; But only so an hour." These lines illustrate the idea that beauty and innocence are temporary and quickly fade away. The comparison of a leaf to a flower emphasizes the brief and ephemeral nature of the beauty. Additionally, the use of the word "hour" suggests that this beauty is short-lived.
These lines are the best examples because they directly convey the idea that nothing gold can stay, highlighting the impermanence of beauty and innocence. This supports the overall theme of the poem and reinforces the message that all things must eventually come to an end.