Stevenson wanted to say that this poem was extremely striking and so profound that it can reach very remote points of the human soul.
I believe that the poem is chilling as a whole and that no part stands out, because all its lines are equally striking.
Explanation:
When Stevenson states that "the furthest reaches of disdain and rage ... bereft of all 'normal human feelings," she means that what she has just read is something very strong and loaded with meaning, capable of touching the reader of grandly. That's because the poem is extremely deep and can reach very remote parts of the soul and trigger feelings so strong and obscure that the beds didn't even know they had them.
