YOURSELF (_referring to the person being spoken to, previously mentioned_, _the reflexive case of_ YOU)
* (reflexive) Your own self (singular).
_Be careful with that fire or you'll burn YOURSELF._
* You (singular); used emphatically, especially to indicate exclusiveness of the referent's participation in the predicate, i.e., that no one else is involved.
_You YOURSELF know that what you wrote was wrong._