Here's why:
* First person refers to the speaker (I, me, my, mine, myself).
* Second person refers to the person being spoken to (you, yours, yourself).
* Third person refers to someone or something else (he, she, it, they, them, his, hers, theirs, himself, herself, themselves).
Since the speaker is using "you", "yours", and "yourself", they are directly addressing the listener, which is characteristic of second person.