In "Young Goodman Brown," what does the devil promise as a baptismal reward, and what prevents Goodman Brown from accepting it?

The devil
promises that if Goodman Brown is baptized, he will be able to know the secret evil within each
member of the human race - he will see "where crime has been committed, and shall exult to
behold the whole earth one stain of guilt".  As Goodman Brown stands waiting to be baptized
with his new wife Faith, the horrible thought that they should see the blackness within each
other causes him to refuse the lurid sacrament, and at the last minute he exhorts Faith to join
him and "look up to heaven, and resist the wicked one". 

I think it
can be argued the the devil's promise is a fitting reward for Goodman Brown because the reason
he chose to leave his Faith and walk awhile with the devil is his curiosity.   Goodman Brown
wanted to know about the dark side of human nature, and ironically, that knowledge is exactly
what he received.  Critics assert that Hawthorne, by shrouding Goodman's life with gloom even
though he did not go so far as to receive the devil's baptism, is commenting on the unforgiving
nature of Puritan religion.  I wonder also if he perhaps may be making a statement about the
danger of yielding even a little bit to the temptation of "wanting to know" - that
innocence can be lost even by the mere experiencing of evil, even if one does not succumb to
it.