The lines that best expresses a theme in the poem is she smiles and smiles and will not sigh.
This is because, according to the first stanza, the poet describes someone (or something) that is optimistic and will keep smiling, no matter what.
A poem is a collection of words by a poet, that is used to convey his feelings and thought.
A theme is the central idea or main aim of a piece of writing.
A stanza is a collection of one or more lines in a poem.
Therefore, from the given poem, the lines that best expresses a theme is she smiles and smiles and will not sigh.
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