Active voice means that a sentence has a subject that acts upon its verb. Passive voice means that a subject is a recipient of a verb's action. You may have learned that the passive voice is weak and incorrect, but it isn't that simple.
Because thats the moment when it show how that character is acting or what is her personality. It can also show it directly by the character's thoughts or indirectly by the character's speeches and actions.
Paul's mother goes shopping every month and her accountant noticed that there were a lot of miscellaneous charges that didn't relate to her shopping trip.
