Why does Yeats use "my deep heart's core" in "The Lake Isle of Innisfree"? -- it is the core that is deep and not the heart.
In the final stanza, the speaker says,
I will arise and go now, for always night and day
I hear lake water lapping with low sounds by the shore;
While I stand on the roadway, or on the pavements grey,
I hear it in the deep heart's core.
Thus, no matter where the speaker is—even if he is on the road somewhere far away or surrounded by gray pavement in a city—he can hear the lapping lake water and the sounds of the shore at Innisfree. When he says that he hears these sounds "in the deep heart's core," he seems to be talking about both the core (or very center) of his own heart as well as the core (or...
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It's called a transferred epithet, but why does he use it? Why doesn't he say "my heart's deep core"? It fits the rhythm -- maybe a little more cumbersome, but not much.