pronoun. you; used emphatically, especially to indicate exclusiveness of the referent's participation in the predicate, i.e., that no one else is involved
n. Your usual, normal, or true self.
the GNU version of the Collaborative International Dictionary of English
pronoun. An emphasized or reflexive form of the pronoun of the second person; -- used as a subject commonly with you; ; also, alone in the predicate, either in the nominative or objective case.
The Century Dictionary and Cyclopedia
An emphatic or reflexive form of the second personal pronoun, ye, you.
Word Usage
""You may be able to protect yourself from all others, but can you always protect yourself _from yourself_?" sighed the old man."