what is the writer's main point?

This is generally a thematic question. While there are a number of points he makes, I find the theme of sin and judgment to stand out. Hawthorne's novel consistently calls into question the notion of sin and what is necessary for redemption. Is Hester's initial crime a sin? She married Chillingworth without quite understanding the commitment she made, and then she had to live without him while he was abroad, then fell in love with Dimmesdale--perhaps discovering the feeling for the first time. Is the sin, then, committing adultery with Dimmesdale and breaking her vow and commitment, or is the sin first marrying Chillingworth without thinking it through? And what is Chillingworth's sin? Check out the link for more,

http://www.gradesaver.com/the-scarlet-letter/study-guide/major-themes/