William Wilson Guilt and Blame Quotes

I would not, if I could, here or to-day, embody a record of my later years of unspeakable misery, and unpardonable crime. (2)

Why does the narrator feel remorse if he has murdered his conscience?

[…] although temptation may have erewhile existed as great, man was never thus, at least, tempted before (1)

William is trying to get off the hook for the terrible deeds he committed.

Yet I must believe that my first mental development had in it much of the uncommon—even much of the outre. (11)

What does William’s unusual upbringing have to do with the person he has become?