When a writer changes viewpoint unnecessarily, we say an error has been made in pronoun shift. The second person pronoun you is often involved in this kind of mistake.
Unnecessary Shift: When a person wants to lose weight, you must first come to grips with self-discipline.
Solution: When a person wants to lose weight, he or she must first come to grips with self-discipline.

 

When communicators refer to themselves, they use first person pronouns such as I, me, we, us, my, our.
When communicators speak or write directly to someone, they use second person pronouns such as you, your, yours.
When communicators refer to someone or something, they use third person pronouns such as he, she, it, its, him, her, his, hers, they, them, their, theirs.