When writing a formal, analytical essay, a student's academic voice needs to shine through. A main voice problem in student academic writing is that students use personal pronouns.
Academic writing requires essays to be written in third person, so the second person voice of you cannot be used. When reading you, readers replace their name for that word, which often confuses the sentence.
Academic writing also avoids first person pronouns like I or we. Writers should simply make statements directly instead of writing "I believe."