From Lenore by Edgar Allan Poe 2. How would you feel if your loved one asked you to run away with him/her after
such a long absence as William had in "Lenore"? Would you drop everything and go, as Lenore did, or would you refuse? What considerations might make this decision either easy or difficult for you? Would more caution have been able to save Lenore from her fate?

edwards uses the phrase "o who can express what the state of a soul in such circumstances is! " in order to illustrate that this type of suffering is unimaginable. the word "express" denoted that the state of a suffering soul is required to be described by any person, but it would not happen because no one can imagine how this suffering is felt.  

-show what might happen if the reader disobeys edwards is not correct because this is described trhough the text, not by the phrase used.

-describe what endless suffering looks and feels like is not correct because this description might be the porpuse of the excerpt provided, not the porpuse of using the phrase during the writting.

-prove that few people have survived limitless suffering is not correct because it is implied that the soul of a person is already suffering and doesn't have any way to escape.

its probably a noun because a noun is a person place or thing

the answer is all of the above.