Answer :
The line "and sore must be the storm" in this given poem "Hope", is example of personification.
What do you mean by 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.
To know more about personification, refer
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