The antithesis in the poem's lines emphasizes the mower's true intention and the personal interpretation of the flowers' meaning.
Antithesis is a literary device involving the presentation of contrasting ideas within a balanced structure. In the lines from the poem, the antithesis serves to emphasize the real reason the mower left the flowers to flourish for their own sake, apart from any human influence or appreciation. It also highlights the speaker's realization that the meaning he finds in the flowers is personal and subjective.
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