In what way does the theme of appearance versus reality arise within the epigraph section of Hurricane Season?

Fernanda Melchor includes an excerpt of W.B.Yeats's poem "Easter, 1916" as the first quote within the epigraph section of the novel Hurricane Season. The lines Melchor chooses to include make it clear that transformation and mutability will be featured as major themes within the coming work. Yeats wrote, "He, too, has been changed in his turn,/Transformed utterly:/A terrible beauty is born" (5).