Why is "The Minister's Black Veil" a parable?

Ais a kind of story,
typically a fictional one, that contains a moral or religious principle.  This story seems to
qualify doubly because it has both.  It demonstrates a theme common to Hawthorne's writings: we
are all sinners; this is certainly a Christian, religious principle.  However, the story also
demonstrates a moral: we all attempt to hide our sinful natures from one anotherand we are
wrong, very wrong and misguided, to do so.  In fact, we add hypocrisy to sin when we encourage
others to believe that we do not have sinful natures.  Moreover, when we fail to publicly
acknowledge our sinful natures, we hang a figurative veil between ourselves and everyone else,
separating and alienating ourselves unnecessarily when we could be commiserating and supporting
one another instead.  This is what Father Hooper's literal veil seems to represent.  With this
figurative veil in place over each of our souls, we prevent ourselves from truly being known or
truly knowing anyone else.