Comparing "Alone" and "The Raven" by Edgar Allan Poe

I'm writing a comparative essay about these two poems. The characters in each poem both suffer from a form of isolation (loss of Lenore in "The Raven", loss of normality in "Alone"). In the end, the two accept their fate (he will always suffer from the grief of Lenore; he will always be different than others no matter what). What drives their isolation? How do they find self-recognition in nature? The raven and the cloud are depicted as devils and in both stories and both deal with nature in a way and open the characters eyes to something they may not have seen before, and this realization fills in the void seen in the beginning. But what exactly causes this to happen?