What are the two crucial passages that develop the theme in "A Worn Path"? Without those two passages, the story would have a completely different...

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is the story of a journey of love.  As such, I think the single most significant passage comes
at the end, when Phoenix is explaining to the nurse the purpose of her visit.  She says,

"My little grandson, he sit up there in the
house...waiting by himself...We is the only two left in the world...He wear a little patch quilt
and peep out holding his mouth open like a little bird...I could tell him...