This was said I believe at the end of the book between chapters 22-24 not exactly sure where
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“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.