“How ignorant art thou in thy pride of wisdom.” (Victor to the magistrate). What is ironic about this statement?

"Man, how ignorant art thou in thy pride of wisdom!” is a statement of irony. The magistrate judges Victor's reaction to Clerval's body in order to assess his guilt, and yet he does not see it. The magistrate's pride overran his wisdom in the same way Victor's ignorance and pride led to the monster's creation in the first place.