What is the tragedy of young goodman brown? and which scenes is it in?

I'm not sure I
agree he discovers the reality of evil, for the ambiguity of the story resides in whether he did
or did not.  Whether or not he discovered it (because maybe it was all a dream....), the
important point is that he more or less became a misanthrope, with no friends, and most
significantly "shrank from the bosom of Faith . . . . and scowled and muttered to
himself."  He lost the capacity for joy in life---that is the , for the story opens with a
lightheartedness that he can never reclaim.  One can fall from innocence to experience and
continue to live a good life, gaining knowledge from the fall that will bring meaning to
life, but he does not gain that sort of knowledge.  Losing faith in humankind, in loved ones, in
a purpose for living:  surely there is no greater tragedy.