The line "and sore must be the storm" in this given poem "Hope", is example of personification.
From 'And sore must be the storm', she is trying to make a comparison in order to express the idea that it is difficult to kill hope.
With personification, you emphasize a characteristics of a non-human (like any object or idea) by describing them with human attributes.
A metaphor is comparison of two things that are not same whereas personification is the process of imbuing non-living objects with human characteristics. Generally, personification can be found in fiction and poetry.
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