The only monsters...

"The only monsters in this world are those who pass for human, who cast shadows and are reflected in mirrors, who smile and speak of compassion and shed convincing tears"

This is an excerpt from a book I recently read, I am curious as to what it means?  I think it is a reference to hypocritical people (Those who pretend to have a belief or moral virtue that they actually do not have.)  I would like some input from you guys...what do you think the quotation means?