yourself

Etymology

From Middle English yourself, equivalent to your + -self.

pron

1. (reflexive) Your own self (singular).
   Be careful with that fire or you'll burn yourself.
2. 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.
   After a good night's sleep you'll feel like yourself again.